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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2012	Feb. 15, 2013	Jun. 30, 2012
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	MSA
Entity Registrant Name	MINE SAFETY APPLIANCES CO
Entity Central Index Key	0000066570
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		37,010,504
Entity Public Float			$ 1,200,000,000

Consolidated Statement of Income - USD ($) $ in Thousands	12 Months Ended
Consolidated Statement of Income - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales	$ 1,168,904	$ 1,173,227	$ 976,631
Other income, net	10,991	5,381	6,037
Sales	1,179,895	1,178,608	982,668
Costs and expenses
Cost of products sold	666,172	702,991	606,532
Selling, general and administrative	321,234	306,367	262,940
Research and development	40,900	39,245	32,784
Restructuring and other charges	2,787	8,559	14,121
Interest expense	11,361	14,117	8,707
Currency exchange losses, net	3,151	2,511	235
Costs and Expenses, Total	1,045,605	1,073,790	925,319
Income before income taxes	134,290	104,818	57,349
Provision for income taxes	42,529	34,773	18,290
Net income	91,761	70,045	39,059
Net income attributable to noncontrolling interests	(1,124)	(193)	(955)
Net income attributable to Mine Safety Appliances Company	$ 90,637	$ 69,852	$ 38,104
Earnings per share attributable to Mine Safety Appliances Company common shareholders
Basic	$ 2.45	$ 1.91	$ 1.06
Diluted	$ 2.42	$ 1.87	$ 1.05

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 91,761	$ 70,045	$ 39,059
Foreign currency translation adjustments	3,846	(15,980)	2,511
Pension and post-retirement plan adjustments	(28,018)	(44,218)	(28)
Comprehensive income	67,589	9,847	41,542
Comprehensive (income) loss attributable to noncontrolling interests	(840)	1,137	(1,898)
Comprehensive income attributable to Mine Safety Appliances Company	$ 66,749	$ 10,984	$ 39,644

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

Amount after tax, before reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency.

+ References

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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Number 51
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+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 82,718	$ 59,938
Trade receivables, less allowance for doubtful accounts of $7,402 and $7,043	191,289	192,627
Inventories	136,300	141,475
Deferred tax assets	17,727	21,744
Income taxes receivable	6,342	13,769
Prepaid expenses and other current assets	29,172	29,296
Total current assets	463,548	458,849
Property
Land	5,267	5,142
Buildings	107,082	104,575
Machinery and equipment	334,951	333,846
Construction in progress	10,444	13,472
Total	457,744	457,035
Less accumulated depreciation	(310,279)	(311,272)
Net property	147,465	145,763
Other Assets Prepaid pension cost	42,818	58,075
Deferred tax assets	17,018	12,065
Goodwill	258,400	259,084
Other noncurrent assets	182,497	181,216
Total assets	1,111,746	1,115,052
Current Liabilities
Notes payable and current portion of long-term debt	6,823	8,263
Accounts payable	59,519	50,208
Employees' compensation	41,602	38,400
Insurance and product liability	15,025	15,738
Taxes on income	4,389	3,051
Other current liabilities	61,442	56,110
Total current liabilities	188,800	171,770
Long-Term Debt	272,333	334,046
Other Liabilities
Pensions and other employee benefits	151,536	124,310
Deferred tax liabilities	17,249	30,458
Other noncurrent liabilities	11,124	15,057
Total liabilities	641,042	675,641
Commitments and Contingencies (Note 19)
Mine Safety Appliances Company shareholders' equity:
Preferred stock, 4 1/2% cumulative, $50 par value (callable at $52.50)	3,569	3,569
Common stock, no par value (shares outstanding: 2012-37,007,799 and 2011-36,692,590)	112,135	97,276
Stock compensation trust	(3,891)	(6,070)
Treasury shares, at cost	(269,739)	(266,231)
Accumulated other comprehensive loss	(127,072)	(103,184)
Retained earnings	747,953	708,306
Total Mine Safety Appliances Company shareholders' equity	462,955	433,666
Noncontrolling interests	7,749	5,745
Total shareholders' equity	470,704	439,411
Total liabilities and shareholders' equity	$ 1,111,746	$ 1,115,052

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Trade receivables, allowance for doubtful accounts	$ 7,402	$ 7,043
Percentage of cumulative preferred stock	4.50%	4.50%
Preferred stock, par value	$ 50	$ 50
Preferred stock, callable per share	52.5	52.5
Common stock, par value	$ 0	$ 0
Common stock, shares outstanding	37,007,799	36,692,590

- Definition

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

+ References + Details

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities
Net income	$ 91,761	$ 70,045	$ 39,059
Depreciation and amortization	31,702	32,866	29,192
Pensions	3,673	(4,967)	(6,391)
Net gain from investing activities-disposal of assets	(8,396)	(3,328)	(5,135)
Stock-based compensation	10,010	7,732	7,335
Deferred income tax provision	213	8,800	7,162
Other noncurrent assets and liabilities	(14,104)	(24,130)	(32,493)
Currency exchange losses, net	3,151	2,511	235
Excess tax benefit related to stock plans	(2,799)	(632)	(3,462)
Other, net	1,103	(1,335)	(1,693)
Operating cash flow before changes in certain working capital items	116,314	87,562	33,809
Trade receivables	2,346	(217)	(10,191)
Inventories	2,677	(1,230)	(10,744)
Accounts payable and accrued liabilities	17,776	(398)	11,145
Income taxes receivable, prepaid expenses and other current assets	11,363	(459)	7,587
Decrease (increase) in certain working capital items	34,162	(2,304)	(2,203)
Cash Flow From operating activities	150,476	85,258	31,606
Investing Activities
Capital expenditures	(32,209)	(30,390)	(25,024)
Property disposals	20,193	18,687	5,699
Acquisitions, net of cash, acquired and other investing	(5,269)		(262,250)
Cash Flow From Investing Activities	(17,285)	(11,703)	(281,575)
Financing Activities
(Payments on) proceeds from short-term debt, net	(128)	137	(6,169)
Proceeds from long-term debt	183,500	164,000	325,000
Payments on long-term debt	(246,500)	(199,000)	(40,000)
Cash dividends paid	(50,990)	(37,741)	(35,928)
Company stock purchases	(3,508)	(624)	(7,572)
Exercise of stock options	4,306	1,316	7,809
Excess tax benefit related to stock plans	2,799	632	3,462
Cash Flow From Financing Activities	(110,521)	(71,280)	246,602
Effect of exchange rate changes on cash and cash equivalents	110	(2,097)	1,144
Increase (decrease) in cash and cash equivalents	22,780	178	(2,223)
Beginning cash and cash equivalents	59,938	59,760	61,983
Ending cash and cash equivalents	82,718	59,938	59,760
Supplemental cash flow information:
Interest payments	10,772	13,969	8,379
Income tax payments	$ 29,807	$ 21,739	$ 25,383

Consolidated Statement of Changes in Retained Earnings and Accumulated Other Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Beginning Balance	$ 439,411
Net income	91,761	$ 70,045	$ 39,059
Pension and post-retirement plan adjustments, net of tax of $11,364 in 2012 $28,636 in 2011 and $205 in 2010	(28,018)	(44,218)	(28)
Preferred dividends	(42)	(42)	(42)
Ending Balance	470,704	439,411
Components of accumulated other comprehensive loss
Cumulative translation adjustments	4,959	829	15,479
Pension and post-retirement plan adjustments	(132,031)	(104,013)	(59,795)
Accumulated other comprehensive loss	(127,072)	(103,184)	(44,316)
Retained Earnings
Beginning Balance	708,306	676,195	674,019
Net income	91,761	70,045	39,059
(Income) loss attributable to noncontrolling interests	(1,124)	(193)	(955)
Common dividends	(50,948)	(37,699)	(35,886)
Preferred dividends	(42)	(42)	(42)
Ending Balance	747,953	708,306	676,195
Accumulated Other Comprehensive (Loss) Income
Beginning Balance	(103,184)	(44,316)	(45,856)
Foreign currency translation adjustments	3,846	(15,980)	2,511
Pension and post-retirement plan adjustments, net of tax of $11,364 in 2012 $28,636 in 2011 and $205 in 2010	(28,018)	(44,218)	(28)
(Income) loss attributable to noncontrolling interests	284	1,330	(943)
Ending Balance	$ (127,072)	$ (103,184)	$ (44,316)

Consolidated Statement of Changes in Retained Earnings and Accumulated Other Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive (Loss) Income
Pension and post-retirement plan adjustments, tax	$ 11,364	$ 28,636	$ 205

Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Significant Accounting Policies

Note 1—Significant Accounting Policies

Use of Estimates—The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Principles of Consolidation—The consolidated financial statements include the accounts of the company and all subsidiaries. Intercompany accounts and transactions are eliminated. Certain prior year amounts have been reclassified to conform with the current year presentation.

Noncontrolling Interests—Noncontrolling interests reflect noncontrolling shareholders’ investments in certain consolidated subsidiaries and their proportionate share of the income and accumulated other comprehensive income of those subsidiaries.

Currency Translation—The functional currency of all significant non-U.S. subsidiaries is the local currency. Assets and liabilities of these operations are translated at year-end exchange rates. Income statement accounts are translated using the average exchange rates for the reporting period. Translation adjustments for these companies are reported as a component of shareholders’ equity and are not included in income. Foreign currency transaction gains and losses are included in net income for the reporting period.

Cash Equivalents—Cash equivalents include temporary deposits with financial institutions and highly liquid investments with original maturities of 90 days or less.

Inventories—Inventories are stated at the lower of cost or market. Most U.S. inventories are valued on the last-in, first-out (LIFO) cost method. Other inventories are valued on the average cost method or at standard costs which approximate actual costs.

Property and Depreciation—Property is recorded at cost. Depreciation is computed using straight-line and accelerated methods over the estimated useful lives of the assets, generally as follows: buildings 20 to 40 years and machinery and equipment 3 to 10 years. Expenditures for significant renewals and improvements are capitalized. Ordinary repairs and maintenance are expensed as incurred. Gains or losses on property dispositions are included in income and the cost and related depreciation are removed from the accounts. Depreciation expense for the years ended December 31, 2012, 2011 and 2010 was $27.5 million, $27.1 million and $25.5 million, respectively.

Goodwill and Other Intangible Assets—Intangible assets are amortized on a straight-line basis over their useful lives. Intangible assets are reviewed for possible impairment whenever circumstances change such that the recorded value of the asset may not be recoverable. Goodwill is not amortized, but is subject to impairment write-down tests. We test the goodwill of each of our reporting units for impairment at least annually. The annual goodwill impairment tests are performed as of September 30 each year. All goodwill is assigned to reporting units. For this purpose, we consider our operating segments to be our reporting units. We test goodwill for impairment by either performing a qualitative evaluation or a two-step quantitative test. The qualitative evaluation is an assessment of various factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value, including goodwill. Factors considered as part of the qualitative assessment include entity-specific industry, market and general economic conditions. We may elect to bypass the qualitative assessment for some or all of our reporting units and perform a two-step quantitative test. Quantitative testing involves estimating a reporting unit’s fair value. We estimate reporting unit fair value using discounted cash flow methodologies. There has been no impairment of our goodwill as of December 31, 2012.

Revenue Recognition—Revenue from the sale of products is recognized when title, ownership and the risk of loss have transferred to the customer, which generally occurs either when product is shipped to the customer or, in the case of most U.S. distributor customers, when product is delivered to the customer’s delivery site. We establish our shipping terms according to local practice and market characteristics. We do not ship product unless we have an order or other documentation authorizing shipment to our customers. We make appropriate provisions for uncollectible accounts receivable and product returns, both of which have historically been insignificant in relation to our net sales. Certain distributor customers receive price rebates based on their level of purchases and other performance criteria that are documented in established distributor programs. These rebates are accrued as a reduction of net sales as they are earned by the customer.

Shipping and Handling—Shipping and handling expenses for products sold to customers are charged to cost of products sold as incurred. Amounts billed to customers for shipping and handling are included in net sales.

Product Warranties—Estimated expenses related to product warranties and additional service actions are charged to cost of products sold in the period in which the related revenue is recognized or when significant product quality issues are identified.

Research and Development—Research and development costs are expensed as incurred.

Income Taxes—Deferred income taxes are provided for temporary differences between financial and tax reporting. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. If it is more likely than not that some portion or all of a deferred tax asset will not be realized, a valuation allowance is recognized. We record tax benefits related to uncertain tax positions taken or expected to be taken on a tax return when such benefits meet a more likely than not threshold. We recognize interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. No provision is made for possible U.S. taxes on the undistributed earnings of foreign subsidiaries that are considered to be reinvested indefinitely.

Stock-Based Compensation—We account for stock-based compensation in accordance with the FASB guidance on share-based payment, which requires that we recognize compensation expense for employee and non-employee director stock-based compensation based on the grant date fair value. Except for retirement-eligible participants, for whom there is no requisite service period, this expense is recognized ratably over the requisite service periods following the date of grant. For retirement-eligible participants, this expense is recognized at the grant date.

Derivative Instruments—We may use derivative instruments to minimize the effects of changes in currency exchange rates. We do not enter into derivative transactions for speculative purposes and do not hold derivative instruments for trading purposes. Changes in the fair value of derivative instruments designated as fair value hedges are recorded in the balance sheet as adjustments to the underlying hedged asset or liability. Changes in the fair value of derivative instruments that do not qualify for hedge accounting treatment are recognized in the income statement in the current period.

Restructuring and Other Charges

12 Months Ended

Dec. 31, 2012

Restructuring and Other Charges

Note 2—Restructuring and Other Charges

During the years ended December 31, 2012, 2011 and 2010, we recorded charges of $2.8 million, $8.6 million and $14.1 million, respectively. These charges were primarily related to reorganization activities.

For the year ended December 31, 2012, North American, European and International segment charges of $1.5 million, $1.1 million and $0.2 million, respectively, were primarily related to severance costs associated with staff reductions.

For the year ended December 31, 2011, European segment charges of $5.8 million related primarily to staff reductions and the transfer of certain production activities to China. North American segment charges for the year ended December 31, 2011 of $1.7 million included costs associated with the relocation of certain administrative and production activities. International segment charges for the year ended December 31, 2011 of $1.1 million were primarily related to severance costs associated with the relocation of our Wuxi, China operations to Suzhou, China.

For the year ended December 31, 2010, European segment charges of $8.8 million related primarily to a focused voluntary retirement incentive program in Germany and severance costs associated with staff reductions. North American segment charges for the year ended December 31, 2010 of $3.8 million included stay bonuses and other costs associated with the transfer of certain production and administrative activities. International segment charges for the year ended December 31, 2010 of $1.5 million were primarily related to severance costs associated with staff reductions.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Inventories

12 Months Ended

Dec. 31, 2012

Inventories

Note 3—Inventories


	December 31,
(In thousands)	2012		2011
Finished products	$	72,658	$	65,687
Work in process		13,473		17,000
Raw materials and supplies		50,169		58,788

Total inventories		136,300		141,475
Excess of FIFO costs over LIFO costs		46,519		47,368

Total FIFO inventories		182,819		188,843

Inventories stated on the LIFO basis represent 16% and 18% of total inventories at December 31, 2012 and 2011, respectively.

Reductions in certain inventory quantities during the years ended December 31, 2012 and 2011 resulted in liquidations of LIFO inventories carried at lower costs prevailing in prior years. The effect of LIFO liquidations during 2012 reduced cost of sales by $0.8 million and increased net income by $0.5 million. The effect of LIFO liquidations during 2011 reduced cost of sales by $0.5 million and increased net income by $0.3 million.

Capital Stock

12 Months Ended

Dec. 31, 2012

Capital Stock

Note 4—Capital Stock

•

Common stock, no par value—180,000,000 shares authorized.

•

Second cumulative preferred voting stock, $10 par value—1,000,000 shares authorized; none issued.

•

4¹/₂% cumulative preferred nonvoting stock, $50 par value—100,000 shares authorized; 71,373 shares issued and 52,878 shares ($1.8 million) held in treasury. There were no treasury share purchases during the three years ended December 31, 2012.

Common stock activity is summarized as follows:


	Shares								Dollars
(Dollars in thousands)	Issued		Stock Compensation Trust			Treasury			Common Stock			Stock Compensation Trust			Treasury Cost
Balances January 1, 2010		62,081,391		(2,174,204	)		(23,934,669	)	$	74,269		$	(11,349	)	$	(256,283	)
Restricted stock awards		—		162,925			—			(850	)		850			—
Restricted stock expense		—		—			—			4,103			—			—
Restricted stock forfeitures		—		—			(1,092	)		(40	)		—			—
Stock options exercised		—		650,565			—			4,413			3,396			—
Stock option expense		—		—			—			2,748			—			—
Performance stock expense		—		—			—			524			—			—
Tax benefit related to stock plans		—		—			—			3,462			—			—
Treasury shares purchased		—		—			(265,190	)		—			—			(7,572	)

Balances December 31, 2010		62,081,391		(1,360,714	)		(24,200,951	)		88,629			(7,103	)		(263,855	)
Restricted stock awards		—		103,815			—			(542	)		542			—
Restricted stock expense		—		—			—			4,376			—			—
Restricted stock forfeitures		—		—			(7,469	)		(6	)		—			—
Stock options exercised		—		94,115			—			825			491			—
Stock option expense		—		—			—			2,343			—			—
Performance stock expense		—		—			—			1,019			—			—
Tax benefit related to stock plans		—		—			—			632			—			—
Treasury shares purchased		—		—			(17,597	)		—			—			(624	)

Balances December 31, 2011		62,081,391		(1,162,784	)		(24,226,017	)		97,276			(6,070	)		(264,479	)
Restricted stock awards		—		136,295			—			(711	)		711			—
Restricted stock expense		—		—			—			4,891			—			—
Restricted stock forfeitures		—		—			(10,815	)		(147	)		—			—
Stock options exercised		—		223,022			—			3,141			1,165			—
Stock option expense		—		—			—			2,435			—			—
Performance stock issued		—		58,037			—			(303	)		303			—
Performance stock expense		—		—			—			2,831			—			—
Tax benefit related to stock plans		—		—			—			2,799			—			—
Treasury shares purchased		—		—			(91,330	)		—			—			(3,508	)
Other, net		—		—			—			(77	)		—			—

Balances December 31, 2012		62,081,391		(745,430	)		(24,328,162	)		112,135			(3,891	)		(267,987	)

The Mine Safety Appliances Company Stock Compensation Trust was established to provide shares for certain benefit plans, including the management and non-employee directors’ equity incentive plans. Shares held by the Stock Compensation Trust, and the corresponding cost of those shares, are reported as a reduction of common shares issued. Differences between the cost of the shares held by the Stock Compensation Trust and the market value of shares released for stock-related benefits are reflected in common stock issued.

Segment Information

12 Months Ended

Dec. 31, 2012

Segment Information

Note 5—Segment Information

We are organized into eleven geographic operating segments based on management responsibilities. The operating segments have been aggregated (based on economic similarities, the nature of their products, end-user markets and methods of distribution) into three reportable segments: North America, Europe and International. Reportable segment information is presented in the following table:


(In thousands)	North America		Europe			International			Reconciling Items			Consolidated Totals
2012
Sales to external customers	$	551,927	$	289,549		$	327,428		$	—		$	1,168,904
Intercompany sales		114,354		98,096			18,641			(231,091	)		—
Net income attributable to Mine Safety Appliances Company		70,930		12,913			22,318			(15,524	)		90,637
Total assets		726,476		352,601			205,959			(173,290	)		1,111,746
Interest income		364		147			1,000			14			1,525
Interest expense		106		350			95			10,810			11,361
Noncash items:
Depreciation and amortization		21,446		5,354			4,902			—			31,702
Pension income (expense)		2,138		(4,700	)		(1,111	)		—			(3,673	)
Income tax provision		42,480		4,858			9,214			(14,023	)		42,529
Capital expenditures		20,129		5,106			6,974			—			32,209
Long-lived assets		119,642		29,882			36,589			—			186,113
2011
Sales to external customers		561,140		286,753			325,334			—			1,173,227
Intercompany sales		100,094		116,471			18,305			(234,870	)		—
Net income attributable to Mine Safety Appliances Company		57,914		7,331			27,152			(22,545	)		69,852
Total assets		742,707		340,305			194,127			(162,087	)		1,115,052
Interest income		78		192			1,267			324			1,861
Interest expense		29		253			138			13,697			14,117
Noncash items:
Depreciation and amortization		22,036		6,239			4,591			—			32,866
Pension income (expense)		10,800		(5,638	)		(195	)		—			4,967
Income tax provision		34,327		3,994			6,442			(9,990	)		34,773
Capital expenditures		20,035		4,384			5,971			—			30,390
Long-lived assets		127,361		29,981			35,540			—			192,882
2010
Sales to external customers		464,012		251,107			261,512			—			976,631
Intercompany sales		84,905		92,526			16,410			(193,841	)		—
Net income attributable to Mine Safety Appliances Company		44,560		(5,371	)		15,835			(16,920	)		38,104
Total assets		810,345		336,095			205,837			(155,089	)		1,197,188
Interest income		329		110			1,212			328			1,979
Interest expense		51		160			100			8,396			8,707
Noncash items:
Depreciation and amortization		18,918		6,116			4,158			—			29,192
Pension income (expense)		13,451		(6,590	)		(470	)		—			6,391
Income tax provision		22,032		769			5,720			(10,231	)		18,290
Capital expenditures		16,806		4,667			3,551			—			25,024
Long-lived assets		142,241		33,199			35,229			—			210,669

Reconciling items consist primarily of intercompany eliminations and items reported at the corporate level.

Geographic information on sales to external customers, based on country of origin:


(In thousands)	2012		2011		2010
United States	$	527,550	$	538,257	$	447,029
Germany		74,557		75,536		77,858
Other		566,797		559,434		451,744

Total		1,168,904		1,173,227		976,631

Geographic information on long-lived assets, based on country of origin:


(In thousands)	2012		2011		2010
United States	$	116,539	$	124,035	$	139,161
Germany		8,781		9,425		10,570
Other		60,793		59,422		60,938

Total		186,113		192,882		210,669

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Name Accounting Standards Codification
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings per Share

12 Months Ended

Dec. 31, 2012

Earnings per Share

Note 6—Earnings per Share

Basic earnings per share is computed by dividing net income, after the deduction of preferred stock dividends and undistributed earnings allocated to participating securities, by the weighted average number of common shares outstanding during the period. Diluted earnings per share assumes the issuance of common stock for all potentially dilutive share equivalents outstanding not classified as participating securities. Participating securities are defined as unvested stock-based payment awards that contain nonforfeitable rights to dividends.


(In thousands, except per share amounts)	2012			2011			2010
Net income attributable to Mine Safety Appliances Company	$	90,637		$	69,852		$	38,104
Preferred stock dividends		(42	)		(42	)		(42	)

Income available to common equity		90,595			69,810			38,062
Dividends and undistributed earnings allocated to participating securities		(865	)		(755	)		(365	)

Income available to common shareholders		89,730			69,055			37,697

Basic earnings per common share	$	2.45		$	1.91		$	1.06

Diluted earnings per common share	$	2.42		$	1.87		$	1.05

Basic shares outstanding		36,564			36,221			35,880
Stock options and other stock compensation		478			610			542

Diluted shares outstanding		37,042			36,831			36,422

Antidilutive stock options		744			894			760

Income Taxes

12 Months Ended

Dec. 31, 2012

Income Taxes

Note 7—Income Taxes


(In thousands)	2012			2011			2010
Components of income before income taxes
U.S. income	$	67,041		$	58,817		$	38,398
Non-U.S. income		67,249			46,001			18,951

Income before income taxes		134,290			104,818			57,349

Provision for income taxes
Current
Federal	$	18,774		$	6,829		$	9,498
State		2,556			872			149
Non-U.S.		20,986			18,272			1,481

Total current provision		42,316			25,973			11,128

Deferred
Federal		(518	)		10,853			3,862
State		(125	)		772			194
Non-U.S.		856			(2,825	)		3,106

Total deferred provision		213			8,800			7,162

Provision for income taxes		42,529			34,773			18,290

Reconciliation of the U.S. federal income tax rates to our effective tax rate:


	2012			2011			2010
U.S. federal income tax rate		35.0	%		35.0	%		35.0	%
State income taxes—U.S.		1.2			1.0			0.4
Taxes on non-U.S. income		(1.4	)		(2.1	)		(0.8	)
Research and development credit		—			(1.3	)		(2.3	)
Manufacturing deduction credit		(1.9	)		(0.3	)		(1.9	)
Valuation allowances		(0.2	)		0.1			2.0
Other		(1.0	)		0.8			(0.5	)

Effective income tax rate		31.7	%		33.2	%		31.9	%

Components of deferred tax assets and liabilities:


	December 31,
(In thousands)	2012			2011
Deferred tax assets
Book expenses capitalized for tax	$	8,213		$	—
Postretirement benefits		19,282			13,561
Inventory reserves		4,780			3,773
Vacation allowances		1,240			1,319
Net operating losses and tax credit carryforwards		7,558			9,436
Post employment benefits		1,006			2,400
Foreign tax credit carryforwards (expiring in 2019)		212			3,463
Stock options		9,672			7,815
Liability insurance		2,754			4,116
Basis of capital assets		1,013			1,102
Warranties		3,078			2,903
Reserve for doubtful accounts		1,547			1,581
Deferred revenue		261			217
Other		4,014			3,788

Total deferred tax assets		64,630			55,474
Valuation allowances		(3,961	)		(2,777	)

Net deferred tax assets		60,669			52,697

Deferred tax liabilities
Property, plant and equipment		(10,547	)		(13,565	)
Pension		(10,915	)		(18,609	)
Intangibles		(21,492	)		(16,209	)
Other		(322	)		(973	)

Total deferred tax liabilities		(43,276	)		(49,356	)

Net deferred taxes		17,393			3,341

At December 31, 2012, we had net operating loss carryforwards of approximately $30.4 million, all of which are in non-U.S. tax jurisdictions. Net operating loss carryforwards of $0.2 million, $0.9 million and $0.1 million will expire in 2014, 2015 and 2016, respectively. The remainder may be carried forward indefinitely.

No deferred U.S. income taxes have been provided on undistributed earnings of non-U.S. subsidiaries, which amounted to $258.0 million as of December 31, 2012. These earnings are considered to be reinvested for an indefinite period of time. It is not practicable to determine the deferred tax liability on these undistributed earnings.

A reconciliation of the change in the tax liability for unrecognized tax benefits for the years ended December 31, 2012 and 2011 is as follows:


(In thousands)	2012			2011
Beginning balance	$	12,827		$	11,827
Adjustments for tax positions related to the current year		(2,672	)		1,268
Adjustments for tax positions related to prior years		(367	)		(9	)
Statute expiration		(268	)		(259	)

Ending balance		9,520			12,827

The total amount of unrecognized tax benefits, if recognized, would reduce our future effective tax rate. We have recognized tax benefits associated with these liabilities in the amount of $8.6 million and $11.4 million at December 31, 2012 and 2011, respectively.

We recognize interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. Our liability for accrued interest and penalties related to uncertain tax positions was $0.9 million at December 31, 2011. During 2012, we reduced interest related to uncertain tax positions by $0.2 million. Our liability for accrued interest and penalties related to uncertain tax positions was $0.7 million at December 31, 2012.

We file a U.S. federal income tax return along with various state and foreign income tax returns. Examinations of our U.S. federal returns have been completed through 2006, and the 2007 and 2008 tax years were closed by statute. Various state and foreign income tax returns may be subject to tax audits after 2006.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 109
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stock Plans

12 Months Ended

Dec. 31, 2012

Stock Plans

Note 8—Stock Plans

The 2008 Management Equity Incentive Plan provides for various forms of stock-based compensation for eligible key employees through May 2018. Management stock-based compensation includes stock options, restricted stock and performance stock units. The 2008 Non-Employee Directors’ Equity Incentive Plan provides for grants of stock options and restricted stock to non-employee directors through May 2018. Stock options are granted at market value option prices and expire after ten years. Stock options are exercisable beginning three years after the grant date. Restricted stock is granted without payment to the company and generally vests three years after the grant date. In general, unvested stock options, restricted stock and performance stock units are forfeited if the participant’s employment with the company terminates for any reason other than retirement, death or disability. Certain restricted stock for management retention vests in three equal tranches four, five and six years after the grant date. Unvested restricted stock for management retention is forfeited if the participant’s employment with the company terminates for any reason other than death or disability. Restricted stock is valued at the market value of the stock on the grant date. The final number of shares to be issued for performance stock units may range from zero to 200% of the target award based on achieving a targeted return on net assets, total shareholder return or other specific performance or market conditions over the performance period. Performance stock units with a performance condition are valued at the market value of the stock on the grant date. Performance stock units with a market condition are valued at an estimated fair value using a Monte Carlo model. We issue Stock Compensation Trust shares or new shares for stock option exercises and grants of restricted stock and performance stock. As of December 31, 2012, there were 2,052,924 and 207,952 shares, respectively, reserved for future grants under the management and non-employee directors’ equity incentive plans.

Stock-based compensation expense was as follows:


(In thousands)	2012		2011		2010
Restricted stock	$	4,744	$	4,370	$	4,063
Stock options		2,435		2,343		2,748
Performance stock		2,831		1,019		524

Total compensation expense before income taxes		10,010		7,732		7,335
Income tax benefit		3,700		2,825		2,653

Total compensation expense, net of income tax benefit		6,310		4,907		4,682

We did not capitalize any stock-based compensation expense in 2012, 2011, or 2010.

Stock option expense is based on the fair value of stock option grants estimated on the grant dates using the Black-Scholes option pricing model and the following weighted average assumptions for options granted in 2012, 2011 and 2010.


	2012			2011			2010
Fair value per option	$	10.77		$	9.94		$	7.21
Risk-free interest rate		1.2	%		2.6	%		3.0	%
Expected dividend yield		3.1	%		3.6	%		3.9	%
Expected volatility		41	%		40	%		40	%
Expected life (years)		6.1			6.1			6.1

The risk-free interest rate is based on the U.S. Treasury Constant Maturity rates as of the grant date converted into an implied spot rate yield curve. Expected dividend yield is based on the most recent annualized dividend divided by the one year average closing share price. Expected volatility is based on the ten year historical volatility using daily stock prices. Expected life is based on historical stock option exercise data.

A summary of option activity follows:


	Shares			Weighted Average Exercise Price		Exercisable at Year-end
Outstanding January 1, 2010		2,085,075		$	25.01
Granted		323,978			25.06
Exercised		(650,565	)		12.00
Expired		(9,485	)		46.73

Outstanding December 31, 2010		1,749,003			29.74		791,759
Granted		166,247			34.09
Exercised		(94,115	)		13.99
Expired		(2,495	)		44.08

Outstanding December 31, 2011		1,818,640			30.94		907,598
Granted		196,469			37.33
Exercised		(223,022	)		18.93
Expired		(5,093	)		43.33
Forfeited		(2,334	)		36.69

Outstanding December 31, 2012		1,784,660			33.05		1,100,300

For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2012 were as follows:


	Stock Options Outstanding
Range of Exercise Prices	Shares		Weighted-Average
Range of Exercise Prices	Shares		Exercise Price		Remaining Life
$10.65 – $21.71		357,569	$	18.03		6.0 Years
$24.63 – $37.33		683,185		30.21		7.7
$40.08 – $50.25		743,906		42.88		3.4

$10.65 – $50.25		1,784,660		33.05		5.6


	Stock Options Exercisable
Range of Exercise Prices	Shares		Weighted-Average
Range of Exercise Prices	Shares		Exercise Price		Remaining Life
$10.65 – $13.57		328,445	$	17.70		6.0 Years
$25.07 – $28.06		49,349		23.27		4.2
$40.08 – $50.25		722,506		42.89		3.2

$10.65 – $50.25		1,100,300		34.49		4.1

Cash received from the exercise of stock options was $4.3 million, $1.3 million and $7.8 million for the years ended December 31, 2012, 2011 and 2010, respectively. The tax benefit we realized from these exercises was $1.6 million, $0.7 million and $4.3 million for the years ended December 31, 2012, 2011 and 2010, respectively.

The aggregate intrinsic value of stock options exercisable at December 31, 2012 was $9.0 million. The aggregate intrinsic value of all stock options outstanding at December 31, 2012 was $17.2 million.

A summary of restricted stock activity follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1, 2010		338,206		$	28.99
Granted		185,216			25.38
Vested		(46,125	)		39.88
Forfeited		(3,660	)		23.93

Unvested at December 31, 2010		473,637			26.56
Granted		125,603			33.61
Vested		(76,505	)		44.39
Forfeited		(10,481	)		24.87

Unvested at December 31, 2011		512,254			25.66
Granted		130,985			37.61
Vested		(209,897	)		20.44
Forfeited		(15,499	)		28.37

Unvested at December 31, 2012		417,843			31.92

A summary of performance stock unit activity follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1, 2010		61,974		$	17.83
Granted		41,984			24.63
Performance adjustments		(18,329	)		20.75

Unvested at December 31, 2010		85,629			20.53
Granted		48,820			33.09
Performance adjustments		(7,506	)		21.14
Forfeited		(1,500	)		30.53

Unvested at December 31, 2011		125,443			25.27
Granted		54,928			41.33
Vested		(47,706	)		18.23
Performance adjustments		5,679			26.39
Forfeited		(672	)		41.45

Unvested at December 31, 2012		137,672			35.85

During the years ended December 31, 2012, 2011 and 2010, the total intrinsic value of stock options exercised (the difference between the market price on the date of exercise and the option price paid to exercise the option) was $4.4 million, $1.8 million and $10.9 million, respectively. The fair values of restricted stock vested during the years ended December 31, 2012, 2011 and 2010 were $8.0 million, $2.6 million and $1.2 million, respectively. The fair value of performance stock units vested during the year ended December 31, 2012 was $1.9 million.

On December 31, 2012, there was $5.5 million of unrecognized stock-based compensation expense. The weighted average period over which this expense is expected to be recognized was approximately one year.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Long-Term Debt

12 Months Ended

Dec. 31, 2012

Long-Term Debt

Note 9—Long-Term Debt


	December 31,
(In thousands)	2012		2011
Industrial development debt issues payable through 2022, 0.30%	$	4,000	$	4,000
Senior Notes payable through 2012, 8.39%		—		8,046
Senior Notes payable through 2021, 5.41%		60,000		60,000
Senior Notes payable through 2021, 4.00%		100,000		100,000
Senior revolving credit facility maturing in 2016		115,000		170,000

Total		279,000		342,046
Amounts due within one year		6,667		8,000

Long-term debt		272,333		334,046

Our unsecured senior revolving credit facility provides for borrowings up to $300.0 million through November 2016 and is subject to certain commitment fees. Loans made under the senior revolving credit facility bear interest at a variable rate. Loan proceeds may be used for general corporate purposes, including working capital, permitted acquisitions, capital expenditures and repayment of existing indebtedness. The credit agreement also provides for an uncommitted incremental facility that permits us, subject to certain conditions, to request an increase in the senior credit facility of up to $50.0 million. At December 31, 2012, $185.0 million of the $300.0 million senior revolving credit facility was unused.

Approximate maturities on our long-term debt over the next five years are $6.7 million in 2013, $6.7 million in 2014, $6.7 million in 2015, $121.7 million in 2016, $26.7 million in 2017, and $110.5 million thereafter. Some debt agreements require us to maintain certain financial ratios and minimum net worth and contain restrictions on the total amount of debt. We were in compliance with our debt covenants at December 31, 2012.

Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets

Note 10—Goodwill and Intangible Assets

Changes in goodwill during the years ended December 31, 2012 and 2011 were as follows:


(In thousands)	2012			2011
Net balance at January 1	$	259,084		$	263,089
Disposals		(1,800	)		(1,800	)
Currency translation		1,116			(2,205	)

Net balance at December 31		258,400			259,084

At December 31, 2012, goodwill of $196.5 million, $59.2 million and $2.7 million related to the North American, European and International reporting segments, respectively.

Changes in intangible assets, net of accumulated amortization, during the years ended December 31, 2012 and 2011 were as follows:


(In thousands)	2012			2011
Net balance at January 1	$	47,119		$	53,880
Amortization expense		(4,181	)		(5,728	)
Disposals		—			(518	)
Impairment losses		(4,272	)		—
Currency translation		(18	)		(515	)

Net balance at December 31		38,648			47,119

Intangible assets include patents and technology, license agreements, copyrights, trade names and distribution agreements. Intangible assets are reported in other noncurrent assets. At December 31, 2012, intangible assets totaled $38.6 million, net of impairment reserves and accumulated amortization of $28.3 million. Intangible asset amortization expense over the next five years is expected to be approximately $3.7 million in 2013, $3.7 million in 2014, $3.7 million in 2015, $3.5 million in 2016 and $3.1 million in 2017.

In December 2012, we discontinued our firefighter location development project and commenced an active program to sell the related intangible assets. As a result of this decision, we recognized an impairment loss $4.3 million to write-off the carrying value of these intangibles, consisting primarily of patents and trade secrets. The impairment loss is reported in other income in the income statement and included in Reconciling Items in segment information.

During 2012, we sold certain assets related to our North American ballistic helmet business, resulting in the disposal of $1.8 million of goodwill. During 2011, we sold certain assets related to our ballistic vest business, resulting in disposals of goodwill and intangible assets of $1.8 million and $0.5 million, respectively. The impact of these transactions and the operating results of the North American ballistic helmet and ballistic vest businesses were not material to net income or earnings per share for all periods presented and are not expected to be significant to future results.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Pensions and Other Postretirement Benefits

12 Months Ended

Dec. 31, 2012

Pensions and Other Postretirement Benefits

Note 11—Pensions and Other Postretirement Benefits

We maintain various defined benefit and defined contribution plans covering the majority of our employees. Our principal U.S. plan is funded in compliance with the Employee Retirement Income Security Act (ERISA). It is our general policy to fund current costs for the international plans, except in Germany and Mexico, where it is common practice and permissible under tax laws to accrue book reserves.

We provide health care benefits and limited life insurance for certain retired employees who are covered by our principal U.S. defined benefit pension plan until they become Medicare-eligible.

Information pertaining to defined benefit pension plans and other postretirement benefits plans is provided in the following table:


	Pension Benefits						Other Benefits
(In thousands)	2012			2011			2012			2011
Change in Benefit Obligations
Benefit obligations at January 1	$	394,269		$	349,755		$	30,425		$	32,734
Service cost		9,511			8,674			694			785
Interest cost		19,018			19,531			1,265			1,501
Participant contributions		137			153			—			—
Actuarial losses (gains)		58,102			37,973			(191	)		(2,281	)
Benefits paid		(17,804	)		(18,931	)		(1,642	)		(2,314	)
Curtailments		—			(54	)		—			—
Settlements		(2,542	)		—			—			—
Termination benefits		387			—			—			—
Currency translation		2,728			(2,832	)		—			—

Benefit obligations at December 31		463,806			394,269			30,551			30,425

Change in Plan Assets
Fair value of plan assets at January 1		357,967			377,607			—			—
Actual return on plan assets		41,478			(4,428	)		—			—
Employer contributions		4,448			4,259			1,642			2,314
Participant contributions		137			153			222			245
Settlements		(2,542	)		—			—			—
Benefits paid		(15,198	)		(16,308	)		(1,864	)		(2,559	)
Reimbursement of German benefits		(2,606	)		(2,622	)		—			—
Currency translation		768			(694	)		—			—

Fair value of plan assets at December 31		384,452			357,967			—			—

Funded Status
Funded status at December 31		(79,354	)		(36,302	)		(30,551	)		(30,425	)
Unrecognized transition losses		24			24			—			—
Unrecognized prior service cost		712			808			(2,618	)		(3,072	)
Unrecognized net actuarial losses		198,169			158,425			11,492			12,212

Net amount recognized		119,551			122,955			(21,677	)		(21,285	)

Amounts Recognized in the Balance Sheet
Noncurrent assets		42,818			58,075			—			—
Current liabilities		(5,021	)		(4,722	)		(1,882	)		(2,096	)
Noncurrent liabilities		(117,151	)		(89,655	)		(28,669	)		(28,329	)

Net amount recognized		(79,354	)		(36,302	)		(30,551	)		(30,425	)

Amounts Recognized in Accumulated Other Comprehensive Income
Net actuarial losses		198,169			158,425			11,492			12,212
Prior service cost (credit)		712			808			(2,618	)		(3,072	)
Unrecognized net initial obligation		24			24			—			—

Total (before tax effects)		198,905			159,257			8,874			9,140

Accumulated Benefit Obligations for all Defined Benefit Plans		414,957			347,636			—			—


	Pension Benefits									Other Benefits
(In thousands)	2012			2011			2010			2012			2011			2010
Components of Net Periodic Benefit (Credit) Cost
Service cost	$	9,511		$	8,674		$	7,702		$	694		$	785		$	763
Interest cost		19,018			19,531			18,615			1,265			1,501			1,730
Expected return on plan assets		(32,328	)		(34,125	)		(34,565	)		—			—			—
Amortization of transition amounts		2			4			4			—			—			—
Amortization of prior service cost		101			104			103			529			710			840
Recognized net actuarial losses (gains)		6,235			793			537			(454	)		(455	)		(555	)
Curtailment loss		747			52			287			—			—			—
Termination benefits		387			—			926			—			—			—

Net periodic benefit cost (credit)		3,673			(4,967	)		(6,391	)		2,034			2,541			2,778

Amounts included in accumulated other comprehensive income expected to be recognized in 2013 net periodic benefit costs.


(In thousands)	Pension Benefits		Other Benefits
Loss recognition	$	14,149	$	676
Prior service cost (credit) recognition		102		(425	)
Transition obligation recognition		3		—


	Pension Benefits						Other Benefits
	2012			2011			2012			2011
Assumptions used to determine benefit obligations
Discount rate		4.0	%		5.0	%		3.8	%		4.8	%
Rate of compensation increase		3.8	%		3.9	%		—			—
Assumptions used to determine net periodic benefit cost
Discount rate		5.0	%		5.6	%		4.8	%		5.3	%
Expected return on plan assets		8.2	%		8.3	%		—			—
Rate of compensation increases		3.9	%		3.7	%		—			—

Discount rates were determined using various corporate bond indexes as indicators of interest rate levels and movements and by matching our projected benefit obligation payment stream to current yields on high quality bonds.

The expected return on assets for the 2012 net periodic pension cost was determined by multiplying the expected returns of each asset class (based on historical returns) by the expected percentage of the total portfolio invested in that asset class. A total return was determined by summing the expected returns over all asset classes.


	Pension Plan Assets at December 31,
	2012			2011
Equity securities		64	%		60	%
Fixed income securities		25			29
Pooled investment funds		6			6
Insurance contracts		3			3
Cash and cash equivalents		2			2

Total		100	%		100	%

The overall objective of our pension investment strategy is to earn a rate of return over time to satisfy the benefit obligations of the pension plans and to maintain sufficient liquidity to pay benefits and meet other cash requirements of our pension funds. Investment policies for our primary U.S. pension plan are determined by the plan’s Investment Committee and set forth in the plan’s investment policy. Asset managers are granted discretion for determining sector mix, selecting securities and timing transactions, subject to the guidelines of the investment policy. An aggressive, flexible management of the portfolio is permitted and encouraged, with shifts of emphasis among equities, fixed income securities and cash equivalents at the discretion of each manager. No target asset allocations are set forth in the investment policy. For our non-U.S. pension plans, our investment objective is generally met through the use of pooled investment funds and insurance contracts.

The following table summarizes our pension plan assets measured at fair value on a recurring basis by fair value hierarchy level (See Note 17):


	December 31, 2012
(In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
Equity securities	$	245,840	$	—	$	—	$	245,840
Fixed income securities		43,600		52,762		—		96,362
Pooled investment funds		—		22,030		—		22,030
Insurance contracts		—		—		12,254		12,254
Cash and cash equivalents		7,966		—		—		7,966

Total		297,406		74,792		12,254		384,452


	December 31, 2011
(In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
Equity securities	$	216,198	$	—	$	—	$	216,198
Fixed income securities		34,636		68,087		—		102,723
Pooled investment funds		—		19,765		—		19,765
Insurance contracts		—		—		11,562		11,562
Cash and cash equivalents		7,719		—		—		7,719

Total		258,553		87,852		11,562		357,967

Equity securities consist primarily of publicly traded U.S. and non-U.S. common stocks. Equities are valued at closing prices reported on the listing stock exchange.

Fixed income securities consist primarily of U.S. government and agency bonds and U.S. corporate bonds. Fixed income securities are valued at closing prices reported in active markets or based on yields currently available on comparable securities of issuers with similar credit ratings. When quoted prices are not available for identical or similar bonds, the bond is valued under a discounted cash flow approach that maximizes observable inputs, such as current yields of similar instruments, and may include adjustments, for certain risks that may not be observable, such as credit and liquidity risks.

Pooled investment funds consist of mutual and collective investment funds that invest primarily in publicly traded non-U.S. equity and fixed income securities. Pooled investment funds are valued at net asset values calculated by the fund manager based on fair value of the underlying securities. The underlying securities are generally valued at closing prices reported in active markets, quoted prices of similar securities, or discounted cash flows approach that maximizes observable inputs such as current value measurement at the reporting date.

Insurance contracts are valued in accordance with the terms of the applicable collective pension contract.

Cash equivalents consist primarily of money market and similar temporary investment funds. Cash equivalents are valued at closing prices reported in active markets.

The preceding methods may produce fair value measurements that are not indicative of net realizable value or reflective of future fair values. Although we believe the valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The following table presents a reconciliation of Level 3 assets:


(In thousands)	Insurance Contracts
Balance January 1, 2011	$	10,725
Net realized and unrealized losses included in earnings		(325	)
Net purchases, issuances and settlements		1,162

Balance December 31, 2011		11,562
Net realized and unrealized gains included in earnings		1,933
Net purchases, issuances and settlements		(1,241	)

Balance December 31, 2012		12,254

We expect to make net contributions of $7.2 million to our pension plans in 2013.

For measurement purposes, 8.3% increase in the costs of covered health care benefits was assumed for the year 2012, decreasing by 0.5% for each successive year to 4.5% in 2019 and thereafter. A one-percentage-point change in assumed health care cost trend rates would have increased or decreased the other postretirement benefit obligations and current year plan expense by approximately $1.8 million and $1.6 million, respectively.

Expense for defined contribution pension plans was $5.9 million in 2012, $5.7 million in 2011 and $5.2 million in 2010.

Estimated pension benefits to be paid under our defined benefit pension plans during the next five years are $20.2 million in 2013, $19.8 million in 2014, $20.5 million in 2015, $21.0 million in 2016, $22.2 million in 2017, and are expected to aggregate $127.8 million for the five years thereafter. Estimated other postretirement benefits to be paid during the next five years are $1.9 million in 2013, $1.9 million in 2014, $1.9 million in 2015, $2.0 million in 2016, $2.2 million in 2017, and are expected to aggregate $11.5 million for the five years thereafter.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Number FAS106-2
-Paragraph 20, 21, 22
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-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Other Income, Net

12 Months Ended

Dec. 31, 2012

Other Income, Net

Note 12—Other Income, Net


(In thousands)	2012			2011		2010
Interest income	$	1,525		$	1,861	$	1,979
Gain on asset dispositions, net		8,396			3,328		5,135
Escrow settlement (See Note 16)		4,790			—		—
Intangible asset impairment loss (See Note 10)		(4,272	)		—		—
Other, net		552			192		(1,077	)

Total		10,991			5,381		6,037

Leases

12 Months Ended

Dec. 31, 2012

Leases

Note 13—Leases

We lease office space, manufacturing and warehouse facilities, automobiles and other equipment under operating lease arrangements. Rent expense was $12.5 million in 2012, $12.2 million in 2011 and $12.8 million in 2010. Minimum rent commitments under noncancelable leases are $10.9 million in 2013, $8.3 million in 2014, $4.9 million in 2015, $3.1 million in 2016, $1.6 million in 2017 and $3.5 million thereafter.

- Definition

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

+ References + Details

Short-Term Debt

12 Months Ended

Dec. 31, 2012

Short-Term Debt

Note 14—Short-Term Debt

Short-term borrowings with banks, which excludes the current portion of long-term debt, was $0.2 million and $0.2 million at December 31, 2012 and 2011, respectively. The average month-end balance of total short-term borrowings during 2012 was $0.9 million. The maximum month-end balance of $2.2 million occurred at January 31, 2012. The weighted average interest rates on short-term borrowings at December 31, 2012 and 2011 were 7% and 12%, respectively.

Derivative Financial Instruments

12 Months Ended

Dec. 31, 2012

Derivative Financial Instruments

Note 15—Derivative Financial Instruments

As part of our currency exchange rate risk management strategy, we enter into certain derivative foreign currency forward contracts that do not meet the GAAP criteria for hedge accounting, but which have the impact of partially offsetting certain foreign currency exposures. We account for these forward contracts on a full mark-to-market basis and report the related gains or losses in currency exchange losses (gains) in the consolidated statement of income. At December 31, 2012, the notional amount of open forward contracts was $30.9 million and the unrealized gain on these contracts was $0.8 million. All open forward contracts will mature during the first quarter of 2013.

The following table presents the balance sheet location and fair value of assets and liabilities associated with derivative financial instruments.


	December 31,
(In thousands)	2012		2011
Derivatives not designated as hedging instruments
Foreign exchange contracts:
Prepaid expenses and other current assets	$	801	$	—
Other current liabilities		—		50

The following table presents the income statement location and impact of derivative financial instruments:

(In thousands)

Income Statement
Location

(Gain) Loss
Recognized in Income

Year ended
December 31,

2012

2011

Derivatives not designated as hedging instruments

Foreign exchange contracts

Currency exchange

losses, net

(1,139

)

1,282

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

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+ Details

Acquisitions

12 Months Ended

Dec. 31, 2012

Acquisitions

Note 16—Acquisitions

In October 2010, we acquired General Monitors, Inc. (GMI) and its affiliated companies, General Monitors Ireland Limited (GMIL) and General Monitors Transnational, LLC (GMT), collectively referred to as General Monitors, for $278.2 million. There was no contingent consideration. At the same time, we entered into an escrow agreement with the sellers, pursuant to which $38.0 million of the purchase price was placed into escrow. GMI, GMIL and GMT became our wholly-owned subsidiaries on the acquisition date.

The acquisition price was funded through borrowings on our unsecured senior revolving credit facility and the issuance of $100.0 million in 4.00% Series A Senior Notes. Borrowings made under the unsecured senior revolving credit facility bear interest at a variable annual rate. The Senior notes, which are unsecured, will mature in October 2021 and are payable in five annual installments of $20.0 million, commencing in October 2017. Interest is payable quarterly.

General Monitors is a leading innovator and developer of advanced fixed gas and flame detection systems that are used in a broad range of oil and gas exploration and refining applications and in diverse industrial plant settings. In addition to providing us with greater access to the global oil and gas market, we believe that the acquisition significantly enhances our long-term corporate strategy in fixed gas and flame detection by providing us with world-class research and development talent and an industry-leading product line.

The following table summarizes the fair values of the General Monitors assets acquired and liabilities assumed at the date of acquisition:


(In millions)	October 13, 2010
Current assets (including cash of $18.6 million)	$	46.8
Property		14.0
Trade name		6.0
Acquired technology		11.0
Customer-related intangibles		27.0
Goodwill		179.9
Other noncurrent assets		3.5

Total assets acquired		288.2
Total liabilities assumed		10.0

Net assets acquired		278.2

We recorded the assets acquired and liabilities assumed in connection with the acquisition at their fair values. Fair values were determined by management with assistance from a third party valuation specialist. The assumptions used in determining fair values were developed by management. Identifiable intangible assets with finite lives are subject to amortization over their estimated useful lives. The identifiable intangible assets acquired in the General Monitors transaction are being amortized over an estimated weighted-average amortization period of 16 years. Estimated future amortization expense related to these identifiable intangible assets is approximately $3.3 million in each of the next five years. The step up to fair value of acquired inventory as part of the purchase price allocation totaled $4.8 million.

Goodwill is calculated as the excess of the purchase price over the fair value of net assets acquired and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Among the factors that contributed to a purchase price in excess of the fair value of the net tangible and intangible assets acquired were the acquisition of an assembled workforce, the expected synergies and other benefits that we believe will result from combining the operations of General Monitors with our operations and the going concern element of General Monitors existing business. Goodwill related to the General Monitors acquisition has been recorded in our reportable segments as follows: $136.7 million in North American segment and $43.2 million in the European segment. North American segment goodwill is tax deductible.

Our results for the year ended December 31, 2010 included transaction and integration costs of $6.5 million ($4.0 million after tax). These costs are reported in selling, general and administrative expenses.

The operating results of General Monitors have been included in our consolidated financial statements since the acquisition date. Our results for the year ended December 31, 2012 include General Monitors sales and net income of $99.5 million and $24.7 million, respectively. Our results for the year ended December 31, 2011 include General Monitors sales and net income of $86.2 million and $16.1 million, respectively. General Monitors net income for the year ended December 31, 2011 includes a one-time increase in cost of sales of $2.3 million ($1.5 million after tax) related to the fair value step-up of inventories acquired from General Monitors and sold during 2011. Our results for the year ended December 31, 2010 include General Monitors sales and net income of $16.3 million and $0.2 million, respectively. General Monitors net income for the year ended December 31, 2010 includes a one-time increase in cost of sales of $2.5 million ($1.5 million after tax) related to the fair value step-up of inventories acquired from General Monitors and sold during 2010.

No pro forma adjustments were required for the year ended December 31, 2012. The following unaudited pro forma financial information presents our combined results as if the acquisition had occurred at the beginning of 2010. The unaudited pro forma financial information was prepared to give effect to events that are directly attributable to the acquisition, factually supportable and expected to have a continuing impact on the combined company’s results. There were no transactions between us and GMI, GMIL or GMT prior to the acquisition that were required to be eliminated. Transactions between GMI, GMIL and GMT during the periods presented have been eliminated in the unaudited pro forma financial information. Pro forma adjustments have been made to reflect the incremental impact on earnings of interest costs on the borrowings that we made to acquire the General Monitors companies, amortization expense related to acquired intangible assets and income tax expense, net of benefits, associated with these adjustments. Pro forma adjustments were also made to the 2010 information to remove the effects of one-time transaction and integration costs and the related tax benefit. The unaudited pro forma financial information does not reflect any cost savings, operating synergies or revenue enhancements that the combined company may achieve as a result of the acquisitions or the costs to integrate the operations or the costs necessary to achieve cost savings, operating synergies or revenue enhancements.

Pro forma financial information (Unaudited)


	Year Ended December 31
(In millions, except per share amounts)	2011		2010
Net sales	$	1,173	$	1,032
Net income		71		50
Basic earnings per share		1.95		1.39
Diluted earnings per share		1.92		1.37

The unaudited pro forma financial information is presented for information purposes only and is not intended to represent or be indicative of the combined results of operations or financial position that we would have reported had the acquisitions been completed as of the date and for the periods presented, and should not be taken as representative of our consolidated results of operations or financial condition following the acquisitions. In addition, the unaudited pro forma financial information is not intended to project the future financial position or results of operations of the combined company.

The unaudited pro forma financial information was prepared using the acquisition method of accounting under existing GAAP.

In December 2012, we settled an escrow claim for indemnification with the sellers of General Monitors. Under the terms of the settlement, we received $4.8 million in December 2012. The settlement proceeds have been recognized in other income because the settlement occurred after the business combination measurement period ended. The escrow agreement has now expired and the remaining escrow account balance was released to the sellers.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

Fair Value Measurements

12 Months Ended

Dec. 31, 2012

Fair Value Measurements

Note 17—Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are:

Level 1—Observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets.

Level 2—Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.

Level 3—Unobservable inputs for the asset or liability.

The valuation methodologies we used to measure financial assets and liabilities were limited to the pension plan assets described in Note 11 and the derivative financial instruments described in Note 15. See Note 11 for the fair value hierarchy classification of pension plan assets. We estimate the fair value of the derivative financial instruments, consisting of foreign currency forward contracts, based upon valuation models with inputs that generally can be verified by observable market conditions and do not involve significant management judgment. Accordingly, the fair values of the derivative financial instruments are classified within Level 2 of the fair value hierarchy.

- Definition

The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

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+ Details

Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2012

Fair Value of Financial Instruments

Note 18—Fair Value of Financial Instruments

With the exception of fixed rate long-term debt, we believe that the reported carrying amounts of our financial assets and liabilities approximate their fair values. At December 31, 2012, the reported carrying amount of our fixed rate long-term debt (including the current portion) was $160.0 million and the fair value was $172.0 million. The fair value of our long-term debt was determined using cash flow valuation models to estimate the market value of similar transactions as of December 31, 2012.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Contingencies

12 Months Ended

Dec. 31, 2012

Contingencies

Note 19—Contingencies

We categorize the product liability losses that we experience into two main categories, single incident and cumulative trauma. Single incident product liability claims are discrete incidents that are typically known to us when they occur and involve observable injuries and, therefore, more quantifiable damages. Therefore, we maintain a reserve for single incident product liability claims based on expected settlement costs for pending claims and an estimate of costs for unreported claims derived from experience, sales volumes and other relevant information. Our reserve for single incident product liability claims at December 31, 2012 and 2011 was $4.4 million and $4.7 million, respectively. Single incident product liability expense during the years ended December 31, 2012, 2011 and 2010 was $0.7 million, $1.5 million and $0.2 million, respectively. We evaluate our single incident product liability exposures on an ongoing basis and make adjustments to the reserve as new information becomes available.

Cumulative trauma product liability claims involve exposures to harmful substances (e.g., silica, asbestos and coal dust) that occurred many years ago and may have developed over long periods of time into diseases such as silicosis, asbestosis or coal worker’s pneumoconiosis. We are presently named as a defendant in 2,609 lawsuits in which plaintiffs allege to have contracted certain cumulative trauma diseases related to exposure to silica, asbestos, and/or coal dust. These lawsuits mainly involve respiratory protection products allegedly manufactured and sold by us. We are unable to estimate total damages sought in these lawsuits as they generally do not specify the injuries alleged or the amount of damages sought, and potentially involve multiple defendants.

Cumulative trauma product liability litigation is difficult to predict. In our experience, until late in a lawsuit, we cannot reasonably determine whether it is probable that any given cumulative trauma lawsuit will ultimately result in a liability. This uncertainty is caused by many factors, including the following: cumulative trauma complaints generally do not provide information sufficient to determine if a loss is probable; cumulative trauma litigation is inherently unpredictable and information is often insufficient to determine if a lawsuit will develop into an actively litigated case; and even when a case is actively litigated, it is often difficult to determine if the lawsuit will be dismissed or otherwise resolved until late in the lawsuit. Moreover, even once it is probable that such a lawsuit will result in a loss, it is difficult to reasonably estimate the amount of actual loss that will be incurred. These amounts are highly variable and turn on a case-by-case analysis of the relevant facts, which are often not learned until late in the lawsuit.

Because of these factors, we cannot reliably determine our potential liability for such claims until late in the lawsuit. We, therefore, do not record cumulative trauma product liability losses when a lawsuit is filed, but rather, when we learn sufficient information to determine that it is probable that we will incur a loss and the amount of loss can be reasonably estimated. We record expenses for defense costs associated with open cumulative trauma product liability lawsuits as incurred.

We cannot estimate any amount or range of possible losses related to resolving pending and future cumulative trauma product liability claims that we may face because of the factors described above. As new information about cumulative trauma product liability cases and future developments becomes available, we reassess our potential exposures.

A summary of cumulative trauma product liability claims activity follows:


	2012			2011			2010
Open claims, January 1		2,321			1,900			2,480
New claims		750			479			260
Settled and dismissed claims		(462	)		(58	)		(840	)

Open claims, December 31		2,609			2,321			1,900

With some common contract exclusions, we maintain insurance for cumulative trauma product liability claims. We have purchased insurance policies from over 20 different insurance carriers that provide coverage for cumulative trauma product liability losses and related defense costs. In the normal course of business, we make payments to settle product liability claims and for related defense costs. We record receivables for the amounts that are covered by insurance. The available limits of these policies are many times our recorded insurance receivable balance.

Various factors could affect the timing and amount of recovery of our insurance receivables, including the outcome of negotiations with insurers, legal proceedings with respect to product liability insurance coverage and the extent to which insurers may become insolvent in the future.

Our insurance receivables at December 31, 2012 and 2011 totaled $130.0 million and $112.1 million, respectively, all of which is reported in other non-current assets.

A summary of insurance receivable balances and activity related to cumulative trauma product liability losses follows:


(In millions)	2012			2011			2010
Balance January 1	$	112.1		$	89.0		$	91.7
Additions		29.7			35.6			30.9
Collections and settlements		(11.8	)		(12.5	)		(33.6	)

Balance December 31		130.0			112.1			89.0

Additions to insurance receivables in the above table represent insured cumulative trauma product liability losses and related defense costs. Uninsured cumulative trauma product liability losses during the years ended December 31, 2012, 2011, and 2010 were $2.1 million, $1.1 million and $0.2 million, respectively.

Our aggregate cumulative trauma product liability losses and administrative and defense costs for the three years ended December 31, 2012, totaled approximately $99.7 million, substantially all of which was insured.

We believe that the increase in the insurance receivable balance that we have experienced since 2005 is primarily due to disagreements among our insurance carriers, and consequently with us, as to when their individual obligations to pay us are triggered and the amount of each insurer’s obligation, as compared to other insurers. We believe that our insurers do not contest that they have issued policies to us or that these policies cover cumulative trauma product liability claims. We believe that our ability to successfully resolve our insurance litigation with various insurance carriers in recent years demonstrates that we have strong legal positions concerning our rights to coverage.

We regularly evaluate the collectability of the insurance receivables and record the amounts that we conclude are probable of collection. Our conclusions are based on our analysis of the terms of the underlying insurance policies, our experience in successfully recovering cumulative trauma product liability claims from our insurers under other policies, the financial ability of our insurance carriers to pay the claims, our understanding and interpretation of the relevant facts and applicable law and the advice of legal counsel, who believe that our insurers are required to provide coverage based on the terms of the policies.

Although the outcome of cumulative trauma product liability matters cannot be predicted with certainty and unfavorable resolutions could materially affect our results of operations on a quarter-to-quarter basis, based on information currently available and the amounts of insurance coverage available to us, we believe that the disposition of cumulative trauma product liability lawsuits that are pending against us will not have a materially adverse effect on our future results of operations, financial condition, or liquidity.

We are currently involved in insurance coverage litigations with various of our insurance carriers.

In 2009, we sued The North River Insurance Company (North River) in the United States District Court for the Western District of Pennsylvania, alleging that North River breached one of its insurance policies by failing to pay amounts owed to us and that it engaged in bad-faith claims handling. We believe that North River’s refusal to indemnify us under the policy for product liability losses and legal fees paid by us is wholly contrary to Pennsylvania law and we are vigorously pursuing the legal actions necessary to collect all due amounts. Discovery is concluding and motions for summary judgment on certain issues will be submitted to the court in the first quarter of 2013. A trial date has not yet been scheduled.

In 2010, North River sued us in the Court of Common Pleas of Allegheny County, Pennsylvania seeking a declaratory judgment concerning their responsibilities under three additional policies shared with Allstate Insurance Company (as successor in interest to policies issued by the Northbrook Excess and Surplus Insurance Company). We asserted claims against North River and Allstate for breaches of contract for failures to pay amounts owed to us. We also alleged that North River engaged in bad-faith claims handling. We believe that North River’s and Allstate’s refusals to indemnify us under these policies for product liability losses and legal fees paid by us is wholly contrary to Pennsylvania law and we are vigorously pursuing the legal actions necessary to collect all due amounts. Discovery is concluding and motions for summary judgment on certain issues will be submitted to the court in the first quarter of 2013. A trial date has not yet been scheduled.

In July 2010, we filed a lawsuit in the Superior Court of the State of Delaware seeking declaratory and other relief from the majority of our excess insurance carriers concerning the future rights and obligations of MSA and our excess insurance carriers under various insurance policies. The reason for this insurance coverage action is to secure a comprehensive resolution of our rights under the insurance policies issued by our insurers. The case is currently in discovery. We have resolved our claims against certain of our insurance carriers on some of their policies through negotiated settlements. When settlement is reached, we dismiss the settling carrier from this action in Delaware.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Assets Held for Sale

12 Months Ended

Dec. 31, 2012

Assets Held for Sale

Note 20—Assets Held for Sale

Certain assets related to detector tube manufacturing are classified as held for sale at December 31, 2012. These assets are reported in the following balance sheet lines:


(In millions)	December 31, 2012
Inventory	$	2.0
Property, net of depreciation		0.3

Total assets		2.3

The potential impact of the sale of detector tube assets is not expected to be material to net income or earnings per share.

Our $3.5 million equity investment in a joint venture company is classified as held for sale at December 31, 2012 and reported in other current assets. The potential impact of the sale of this investment is not expected to be material to net income or earnings per share.

Recently Adopted and Recently Issued Accounting Standards

12 Months Ended

Dec. 31, 2012

Recently Adopted and Recently Issued Accounting Standards

Note 21—Recently Adopted and Recently Issued Accounting Standards

In May 2011, the FASB issued ASU 2011-04, Fair Value Measurement—Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS. This ASU updated measurement guidance to improve the comparability of fair value measurements between U.S.GAAP and International Financial Reporting Standards and enhanced disclosure requirements. The most significant change in disclosures is an expansion of information related to fair value measurements categorized within Level 3 of the fair value hierarchy. The adoption of this ASU on January 1, 2012 did not have a material effect on our consolidated financial statements.

In June 2011, the FASB issued ASU 2011-05, Comprehensive Income—Presentation of Comprehensive Income. This ASU requires net income and comprehensive income to be presented in either a single continuous statement or in two separate, but consecutive, statements. In December 2011, the FASB issued ASU 2011-12, which indefinitely deferred the ASU 2011-05 requirement related to the presentation of reclassification adjustments from accumulated other comprehensive income. The adoption of ASU 2011-05 on January 1, 2012 did not have a material effect on our results of operations or financial position, but did change the format of the presentation of comprehensive income.

In September 2011, the FASB issued ASU 2011-08, Intangibles-Goodwill and Other-Testing Goodwill for Impairment. This ASU reduces the complexity of performing an annual goodwill impairment test by permitting companies to perform an assessment of qualitative factors to determine whether additional goodwill impairment testing is necessary. The adoption of this ASU, on January 1, 2012 did not have a material effect on our consolidated financial statements.

In February 2013, the FASB issued ASU 2013-02, Comprehensive Income-Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. This ASU requires additional information about the amounts reclassified out of accumulated other comprehensive income by component. The ASU will be effective beginning in 2013. The adoption of this ASU will not have a material effect on our consolidated financial statements, but will change disclosures related to comprehensive income.

Quarterly Financial Information

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information

Note 22—Quarterly Financial Information (Unaudited)


	2012
	Quarters								Year
(In thousands, except earnings per share)	1st		2nd		3rd		4th		Year
Net sales	$	293,485	$	294,738	$	286,567	$	294,114	$	1,168,904
Gross profit		126,991		123,126		122,254		130,361		502,732
Net income attributable to Mine Safety Appliances Company		23,922		27,995		19,233		19,487		90,637
Earnings per share attributable to Mine Safety Appliances Company shareholders:
Basic		.65		.76		.52		.53		2.45
Diluted		.64		.75		.51		.52		2.42


	2011
	Quarters								Year
(In thousands, except earnings per share)	1st		2nd		3rd		4th		Year
Net sales	$	276,499	$	294,733	$	298,241	$	303,754	$	1,173,227
Gross profit		110,397		119,009		120,888		119,942		470,236
Net income attributable to Mine Safety Appliances Company		13,309		19,592		19,972		16,979		69,852
Earnings per share attributable to Mine Safety Appliances Company shareholders:
Basic		.36		.53		.54		.46		1.91
Diluted		.36		.53		.54		.46		1.87

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2012

Valuation and Qualifying Accounts

SCHEDULE II

MINE SAFETY APPLIANCES COMPANY AND AFFILIATES

VALUATION AND QUALIFYING ACCOUNTS

THREE YEARS ENDED DECEMBER 31, 2012


	2012		2011		2010
	*(In thousands)*
Allowance for doubtful accounts:
Balance at beginning of year	$	7,043	$	9,391	$	6,866
Additions—
Charged to costs and expenses		1,289		1,148		3,294
Deductions—
Deductions from reserves, net (1)(2)		930		3,496		769

Balance at end of year		7,402		7,043		9,391

Income tax valuation allowance:
Balance at beginning of year	$	2,777	$	4,323	$	3,174
Additions—
Charged to costs and expenses (3)		1,184		—		1,149
Deductions—
Deductions from reserves (3)		—		1,546		—

Balance at end of year		3,961		2,777		4,323

(1)	Bad debts written off, net of recoveries.

(2)	Activity for 2012, 2011 and 2010 includes currency translation gains (losses) of $428, $(387) and $323, respectively.

(3)	Activity for 2012, 2011 and 2010 includes currency translation gains (losses) of $97, $(123) and $87, respectively.

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2012
Use of Estimates	*Use of Estimates—*The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Principles of Consolidation	*Principles of Consolidation—*The consolidated financial statements include the accounts of the company and all subsidiaries. Intercompany accounts and transactions are eliminated. Certain prior year amounts have been reclassified to conform with the current year presentation.
Noncontrolling Interests	*Noncontrolling Interests—*Noncontrolling interests reflect noncontrolling shareholders’ investments in certain consolidated subsidiaries and their proportionate share of the income and accumulated other comprehensive income of those subsidiaries.
Currency Translation	*Currency Translation—*The functional currency of all significant non-U.S. subsidiaries is the local currency. Assets and liabilities of these operations are translated at year-end exchange rates. Income statement accounts are translated using the average exchange rates for the reporting period. Translation adjustments for these companies are reported as a component of shareholders’ equity and are not included in income. Foreign currency transaction gains and losses are included in net income for the reporting period.
Cash Equivalents	*Cash Equivalents—*Cash equivalents include temporary deposits with financial institutions and highly liquid investments with original maturities of 90 days or less.
Inventories	*Inventories—*Inventories are stated at the lower of cost or market. Most U.S. inventories are valued on the last-in, first-out (LIFO) cost method. Other inventories are valued on the average cost method or at standard costs which approximate actual costs.
Property and Depreciation	*Property and Depreciation—*Property is recorded at cost. Depreciation is computed using straight-line and accelerated methods over the estimated useful lives of the assets, generally as follows: buildings 20 to 40 years and machinery and equipment 3 to 10 years. Expenditures for significant renewals and improvements are capitalized. Ordinary repairs and maintenance are expensed as incurred. Gains or losses on property dispositions are included in income and the cost and related depreciation are removed from the accounts. Depreciation expense for the years ended December 31, 2012, 2011 and 2010 was $27.5 million, $27.1 million and $25.5 million, respectively.
Goodwill and Other Intangible Assets	*Goodwill and Other Intangible Assets—*Intangible assets are amortized on a straight-line basis over their useful lives. Intangible assets are reviewed for possible impairment whenever circumstances change such that the recorded value of the asset may not be recoverable. Goodwill is not amortized, but is subject to impairment write-down tests. We test the goodwill of each of our reporting units for impairment at least annually. The annual goodwill impairment tests are performed as of September 30 each year. All goodwill is assigned to reporting units. For this purpose, we consider our operating segments to be our reporting units. We test goodwill for impairment by either performing a qualitative evaluation or a two-step quantitative test. The qualitative evaluation is an assessment of various factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value, including goodwill. Factors considered as part of the qualitative assessment include entity-specific industry, market and general economic conditions. We may elect to bypass the qualitative assessment for some or all of our reporting units and perform a two-step quantitative test. Quantitative testing involves estimating a reporting unit’s fair value. We estimate reporting unit fair value using discounted cash flow methodologies. There has been no impairment of our goodwill as of December 31, 2012.
Revenue Recognition	*Revenue Recognition—*Revenue from the sale of products is recognized when title, ownership and the risk of loss have transferred to the customer, which generally occurs either when product is shipped to the customer or, in the case of most U.S. distributor customers, when product is delivered to the customer’s delivery site. We establish our shipping terms according to local practice and market characteristics. We do not ship product unless we have an order or other documentation authorizing shipment to our customers. We make appropriate provisions for uncollectible accounts receivable and product returns, both of which have historically been insignificant in relation to our net sales. Certain distributor customers receive price rebates based on their level of purchases and other performance criteria that are documented in established distributor programs. These rebates are accrued as a reduction of net sales as they are earned by the customer.
Shipping and Handling	*Shipping and Handling—*Shipping and handling expenses for products sold to customers are charged to cost of products sold as incurred. Amounts billed to customers for shipping and handling are included in net sales.
Product Warranties	*Product Warranties—*Estimated expenses related to product warranties and additional service actions are charged to cost of products sold in the period in which the related revenue is recognized or when significant product quality issues are identified.
Research and Development	*Research and Development—*Research and development costs are expensed as incurred.
Income Taxes	*Income Taxes—*Deferred income taxes are provided for temporary differences between financial and tax reporting. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. If it is more likely than not that some portion or all of a deferred tax asset will not be realized, a valuation allowance is recognized. We record tax benefits related to uncertain tax positions taken or expected to be taken on a tax return when such benefits meet a more likely than not threshold. We recognize interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. No provision is made for possible U.S. taxes on the undistributed earnings of foreign subsidiaries that are considered to be reinvested indefinitely.
Stock-Based Compensation	*Stock-Based Compensation—*We account for stock-based compensation in accordance with the FASB guidance on share-based payment, which requires that we recognize compensation expense for employee and non-employee director stock-based compensation based on the grant date fair value. Except for retirement-eligible participants, for whom there is no requisite service period, this expense is recognized ratably over the requisite service periods following the date of grant. For retirement-eligible participants, this expense is recognized at the grant date.
Derivative Instruments	*Derivative Instruments—*We may use derivative instruments to minimize the effects of changes in currency exchange rates. We do not enter into derivative transactions for speculative purposes and do not hold derivative instruments for trading purposes. Changes in the fair value of derivative instruments designated as fair value hedges are recorded in the balance sheet as adjustments to the underlying hedged asset or liability. Changes in the fair value of derivative instruments that do not qualify for hedge accounting treatment are recognized in the income statement in the current period.

Inventories (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Inventories


	December 31,
(In thousands)	2012		2011
Finished products	$	72,658	$	65,687
Work in process		13,473		17,000
Raw materials and supplies		50,169		58,788

Total inventories		136,300		141,475
Excess of FIFO costs over LIFO costs		46,519		47,368

Total FIFO inventories		182,819		188,843

Capital Stock (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Common Stock Activity

Common stock activity is summarized as follows:


	Shares								Dollars
(Dollars in thousands)	Issued		Stock Compensation Trust			Treasury			Common Stock			Stock Compensation Trust			Treasury Cost
Balances January 1, 2010		62,081,391		(2,174,204	)		(23,934,669	)	$	74,269		$	(11,349	)	$	(256,283	)
Restricted stock awards		—		162,925			—			(850	)		850			—
Restricted stock expense		—		—			—			4,103			—			—
Restricted stock forfeitures		—		—			(1,092	)		(40	)		—			—
Stock options exercised		—		650,565			—			4,413			3,396			—
Stock option expense		—		—			—			2,748			—			—
Performance stock expense		—		—			—			524			—			—
Tax benefit related to stock plans		—		—			—			3,462			—			—
Treasury shares purchased		—		—			(265,190	)		—			—			(7,572	)

Balances December 31, 2010		62,081,391		(1,360,714	)		(24,200,951	)		88,629			(7,103	)		(263,855	)
Restricted stock awards		—		103,815			—			(542	)		542			—
Restricted stock expense		—		—			—			4,376			—			—
Restricted stock forfeitures		—		—			(7,469	)		(6	)		—			—
Stock options exercised		—		94,115			—			825			491			—
Stock option expense		—		—			—			2,343			—			—
Performance stock expense		—		—			—			1,019			—			—
Tax benefit related to stock plans		—		—			—			632			—			—
Treasury shares purchased		—		—			(17,597	)		—			—			(624	)

Balances December 31, 2011		62,081,391		(1,162,784	)		(24,226,017	)		97,276			(6,070	)		(264,479	)
Restricted stock awards		—		136,295			—			(711	)		711			—
Restricted stock expense		—		—			—			4,891			—			—
Restricted stock forfeitures		—		—			(10,815	)		(147	)		—			—
Stock options exercised		—		223,022			—			3,141			1,165			—
Stock option expense		—		—			—			2,435			—			—
Performance stock issued		—		58,037			—			(303	)		303			—
Performance stock expense		—		—			—			2,831			—			—
Tax benefit related to stock plans		—		—			—			2,799			—			—
Treasury shares purchased		—		—			(91,330	)		—			—			(3,508	)
Other, net		—		—			—			(77	)		—			—

Balances December 31, 2012		62,081,391		(745,430	)		(24,328,162	)		112,135			(3,891	)		(267,987	)

Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Reportable Segment Information

Reportable segment information is presented in the following table:


(In thousands)	North America		Europe			International			Reconciling Items			Consolidated Totals
2012
Sales to external customers	$	551,927	$	289,549		$	327,428		$	—		$	1,168,904
Intercompany sales		114,354		98,096			18,641			(231,091	)		—
Net income attributable to Mine Safety Appliances Company		70,930		12,913			22,318			(15,524	)		90,637
Total assets		726,476		352,601			205,959			(173,290	)		1,111,746
Interest income		364		147			1,000			14			1,525
Interest expense		106		350			95			10,810			11,361
Noncash items:
Depreciation and amortization		21,446		5,354			4,902			—			31,702
Pension income (expense)		2,138		(4,700	)		(1,111	)		—			(3,673	)
Income tax provision		42,480		4,858			9,214			(14,023	)		42,529
Capital expenditures		20,129		5,106			6,974			—			32,209
Long-lived assets		119,642		29,882			36,589			—			186,113
2011
Sales to external customers		561,140		286,753			325,334			—			1,173,227
Intercompany sales		100,094		116,471			18,305			(234,870	)		—
Net income attributable to Mine Safety Appliances Company		57,914		7,331			27,152			(22,545	)		69,852
Total assets		742,707		340,305			194,127			(162,087	)		1,115,052
Interest income		78		192			1,267			324			1,861
Interest expense		29		253			138			13,697			14,117
Noncash items:
Depreciation and amortization		22,036		6,239			4,591			—			32,866
Pension income (expense)		10,800		(5,638	)		(195	)		—			4,967
Income tax provision		34,327		3,994			6,442			(9,990	)		34,773
Capital expenditures		20,035		4,384			5,971			—			30,390
Long-lived assets		127,361		29,981			35,540			—			192,882
2010
Sales to external customers		464,012		251,107			261,512			—			976,631
Intercompany sales		84,905		92,526			16,410			(193,841	)		—
Net income attributable to Mine Safety Appliances Company		44,560		(5,371	)		15,835			(16,920	)		38,104
Total assets		810,345		336,095			205,837			(155,089	)		1,197,188
Interest income		329		110			1,212			328			1,979
Interest expense		51		160			100			8,396			8,707
Noncash items:
Depreciation and amortization		18,918		6,116			4,158			—			29,192
Pension income (expense)		13,451		(6,590	)		(470	)		—			6,391
Income tax provision		22,032		769			5,720			(10,231	)		18,290
Capital expenditures		16,806		4,667			3,551			—			25,024
Long-lived assets		142,241		33,199			35,229			—			210,669

Schedule Of Geographic Information On Sales To External Customers, Based On Country Of Origin

Geographic information on sales to external customers, based on country of origin:


(In thousands)	2012		2011		2010
United States	$	527,550	$	538,257	$	447,029
Germany		74,557		75,536		77,858
Other		566,797		559,434		451,744

Total		1,168,904		1,173,227		976,631

Schedule Of Geographic Information On Long-Lived Assets, Based On Country Of Origin

Geographic information on long-lived assets, based on country of origin:


(In thousands)	2012		2011		2010
United States	$	116,539	$	124,035	$	139,161
Germany		8,781		9,425		10,570
Other		60,793		59,422		60,938

Total		186,113		192,882		210,669

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Earnings Per Share


(In thousands, except per share amounts)	2012			2011			2010
Net income attributable to Mine Safety Appliances Company	$	90,637		$	69,852		$	38,104
Preferred stock dividends		(42	)		(42	)		(42	)

Income available to common equity		90,595			69,810			38,062
Dividends and undistributed earnings allocated to participating securities		(865	)		(755	)		(365	)

Income available to common shareholders		89,730			69,055			37,697

Basic earnings per common share	$	2.45		$	1.91		$	1.06

Diluted earnings per common share	$	2.42		$	1.87		$	1.05

Basic shares outstanding		36,564			36,221			35,880
Stock options and other stock compensation		478			610			542

Diluted shares outstanding		37,042			36,831			36,422

Antidilutive stock options		744			894			760

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Components Of Income Before Income Taxes


(In thousands)	2012			2011			2010
Components of income before income taxes
U.S. income	$	67,041		$	58,817		$	38,398
Non-U.S. income		67,249			46,001			18,951

Income before income taxes		134,290			104,818			57,349

Provision for income taxes
Current
Federal	$	18,774		$	6,829		$	9,498
State		2,556			872			149
Non-U.S.		20,986			18,272			1,481

Total current provision		42,316			25,973			11,128

Deferred
Federal		(518	)		10,853			3,862
State		(125	)		772			194
Non-U.S.		856			(2,825	)		3,106

Total deferred provision		213			8,800			7,162

Provision for income taxes		42,529			34,773			18,290

Reconciliation Of U.S. Federal Income Tax Rates To Effective Tax Rate

Reconciliation of the U.S. federal income tax rates to our effective tax rate:


	2012			2011			2010
U.S. federal income tax rate		35.0	%		35.0	%		35.0	%
State income taxes—U.S.		1.2			1.0			0.4
Taxes on non-U.S. income		(1.4	)		(2.1	)		(0.8	)
Research and development credit		—			(1.3	)		(2.3	)
Manufacturing deduction credit		(1.9	)		(0.3	)		(1.9	)
Valuation allowances		(0.2	)		0.1			2.0
Other		(1.0	)		0.8			(0.5	)

Effective income tax rate		31.7	%		33.2	%		31.9	%

Components of Deferred Tax Assets and Liabilities

Components of deferred tax assets and liabilities:


	December 31,
(In thousands)	2012			2011
Deferred tax assets
Book expenses capitalized for tax	$	8,213		$	—
Postretirement benefits		19,282			13,561
Inventory reserves		4,780			3,773
Vacation allowances		1,240			1,319
Net operating losses and tax credit carryforwards		7,558			9,436
Post employment benefits		1,006			2,400
Foreign tax credit carryforwards (expiring in 2019)		212			3,463
Stock options		9,672			7,815
Liability insurance		2,754			4,116
Basis of capital assets		1,013			1,102
Warranties		3,078			2,903
Reserve for doubtful accounts		1,547			1,581
Deferred revenue		261			217
Other		4,014			3,788

Total deferred tax assets		64,630			55,474
Valuation allowances		(3,961	)		(2,777	)

Net deferred tax assets		60,669			52,697

Deferred tax liabilities
Property, plant and equipment		(10,547	)		(13,565	)
Pension		(10,915	)		(18,609	)
Intangibles		(21,492	)		(16,209	)
Other		(322	)		(973	)

Total deferred tax liabilities		(43,276	)		(49,356	)

Net deferred taxes		17,393			3,341

Schedule Of Reconciliation Of Change In Tax Liability For Unrecognized Tax Benefits

A reconciliation of the change in the tax liability for unrecognized tax benefits for the years ended December 31, 2012 and 2011 is as follows:


(In thousands)	2012			2011
Beginning balance	$	12,827		$	11,827
Adjustments for tax positions related to the current year		(2,672	)		1,268
Adjustments for tax positions related to prior years		(367	)		(9	)
Statute expiration		(268	)		(259	)

Ending balance		9,520			12,827

Stock Plans (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Stock-Based Compensation Expense

Stock-based compensation expense was as follows:


(In thousands)	2012		2011		2010
Restricted stock	$	4,744	$	4,370	$	4,063
Stock options		2,435		2,343		2,748
Performance stock		2,831		1,019		524

Total compensation expense before income taxes		10,010		7,732		7,335
Income tax benefit		3,700		2,825		2,653

Total compensation expense, net of income tax benefit		6,310		4,907		4,682

Schedule Of Fair Value Weighted Average Assumptions For Options Granted


	2012			2011			2010
Fair value per option	$	10.77		$	9.94		$	7.21
Risk-free interest rate		1.2	%		2.6	%		3.0	%
Expected dividend yield		3.1	%		3.6	%		3.9	%
Expected volatility		41	%		40	%		40	%
Expected life (years)		6.1			6.1			6.1

Summary Of Option Activity

A summary of option activity follows:


	Shares			Weighted Average Exercise Price		Exercisable at Year-end
Outstanding January 1, 2010		2,085,075		$	25.01
Granted		323,978			25.06
Exercised		(650,565	)		12.00
Expired		(9,485	)		46.73

Outstanding December 31, 2010		1,749,003			29.74		791,759
Granted		166,247			34.09
Exercised		(94,115	)		13.99
Expired		(2,495	)		44.08

Outstanding December 31, 2011		1,818,640			30.94		907,598
Granted		196,469			37.33
Exercised		(223,022	)		18.93
Expired		(5,093	)		43.33
Forfeited		(2,334	)		36.69

Outstanding December 31, 2012		1,784,660			33.05		1,100,300

Characteristics of Outstanding and Exercisable Stock Options

For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2012 were as follows:


	Stock Options Outstanding
Range of Exercise Prices	Shares		Weighted-Average
Range of Exercise Prices	Shares		Exercise Price		Remaining Life
$10.65 – $21.71		357,569	$	18.03		6.0 Years
$24.63 – $37.33		683,185		30.21		7.7
$40.08 – $50.25		743,906		42.88		3.4

$10.65 – $50.25		1,784,660		33.05		5.6


	Stock Options Exercisable
Range of Exercise Prices	Shares		Weighted-Average
Range of Exercise Prices	Shares		Exercise Price		Remaining Life
$10.65 – $13.57		328,445	$	17.70		6.0 Years
$25.07 – $28.06		49,349		23.27		4.2
$40.08 – $50.25		722,506		42.89		3.2

$10.65 – $50.25		1,100,300		34.49		4.1

Summary of Restricted Stock Activity

A summary of restricted stock activity follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1, 2010		338,206		$	28.99
Granted		185,216			25.38
Vested		(46,125	)		39.88
Forfeited		(3,660	)		23.93

Unvested at December 31, 2010		473,637			26.56
Granted		125,603			33.61
Vested		(76,505	)		44.39
Forfeited		(10,481	)		24.87

Unvested at December 31, 2011		512,254			25.66
Granted		130,985			37.61
Vested		(209,897	)		20.44
Forfeited		(15,499	)		28.37

Unvested at December 31, 2012		417,843			31.92

Summary of Performance Stock Unit Activity

A summary of performance stock unit activity follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1, 2010		61,974		$	17.83
Granted		41,984			24.63
Performance adjustments		(18,329	)		20.75

Unvested at December 31, 2010		85,629			20.53
Granted		48,820			33.09
Performance adjustments		(7,506	)		21.14
Forfeited		(1,500	)		30.53

Unvested at December 31, 2011		125,443			25.27
Granted		54,928			41.33
Vested		(47,706	)		18.23
Performance adjustments		5,679			26.39
Forfeited		(672	)		41.45

Unvested at December 31, 2012		137,672			35.85

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Outstanding Debt


	December 31,
(In thousands)	2012		2011
Industrial development debt issues payable through 2022, 0.30%	$	4,000	$	4,000
Senior Notes payable through 2012, 8.39%		—		8,046
Senior Notes payable through 2021, 5.41%		60,000		60,000
Senior Notes payable through 2021, 4.00%		100,000		100,000
Senior revolving credit facility maturing in 2016		115,000		170,000

Total		279,000		342,046
Amounts due within one year		6,667		8,000

Long-term debt		272,333		334,046

Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Changes In Goodwill

Changes in goodwill during the years ended December 31, 2012 and 2011 were as follows:


(In thousands)	2012			2011
Net balance at January 1	$	259,084		$	263,089
Disposals		(1,800	)		(1,800	)
Currency translation		1,116			(2,205	)

Net balance at December 31		258,400			259,084

Changes In Intangible Assets, Net Of Accumulated Amortization

Changes in intangible assets, net of accumulated amortization, during the years ended December 31, 2012 and 2011 were as follows:


(In thousands)	2012			2011
Net balance at January 1	$	47,119		$	53,880
Amortization expense		(4,181	)		(5,728	)
Disposals		—			(518	)
Impairment losses		(4,272	)		—
Currency translation		(18	)		(515	)

Net balance at December 31		38,648			47,119

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Pensions and Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Defined Benefit Pension Plans And Other Postretirement Benefits Plan

Information pertaining to defined benefit pension plans and other postretirement benefits plans is provided in the following table:


	Pension Benefits						Other Benefits
(In thousands)	2012			2011			2012			2011
Change in Benefit Obligations
Benefit obligations at January 1	$	394,269		$	349,755		$	30,425		$	32,734
Service cost		9,511			8,674			694			785
Interest cost		19,018			19,531			1,265			1,501
Participant contributions		137			153			—			—
Actuarial losses (gains)		58,102			37,973			(191	)		(2,281	)
Benefits paid		(17,804	)		(18,931	)		(1,642	)		(2,314	)
Curtailments		—			(54	)		—			—
Settlements		(2,542	)		—			—			—
Termination benefits		387			—			—			—
Currency translation		2,728			(2,832	)		—			—

Benefit obligations at December 31		463,806			394,269			30,551			30,425

Change in Plan Assets
Fair value of plan assets at January 1		357,967			377,607			—			—
Actual return on plan assets		41,478			(4,428	)		—			—
Employer contributions		4,448			4,259			1,642			2,314
Participant contributions		137			153			222			245
Settlements		(2,542	)		—			—			—
Benefits paid		(15,198	)		(16,308	)		(1,864	)		(2,559	)
Reimbursement of German benefits		(2,606	)		(2,622	)		—			—
Currency translation		768			(694	)		—			—

Fair value of plan assets at December 31		384,452			357,967			—			—

Funded Status
Funded status at December 31		(79,354	)		(36,302	)		(30,551	)		(30,425	)
Unrecognized transition losses		24			24			—			—
Unrecognized prior service cost		712			808			(2,618	)		(3,072	)
Unrecognized net actuarial losses		198,169			158,425			11,492			12,212

Net amount recognized		119,551			122,955			(21,677	)		(21,285	)

Amounts Recognized in the Balance Sheet
Noncurrent assets		42,818			58,075			—			—
Current liabilities		(5,021	)		(4,722	)		(1,882	)		(2,096	)
Noncurrent liabilities		(117,151	)		(89,655	)		(28,669	)		(28,329	)

Net amount recognized		(79,354	)		(36,302	)		(30,551	)		(30,425	)

Amounts Recognized in Accumulated Other Comprehensive Income
Net actuarial losses		198,169			158,425			11,492			12,212
Prior service cost (credit)		712			808			(2,618	)		(3,072	)
Unrecognized net initial obligation		24			24			—			—

Total (before tax effects)		198,905			159,257			8,874			9,140

Accumulated Benefit Obligations for all Defined Benefit Plans		414,957			347,636			—			—

Components Of Net Periodic Benefit (Credit) Cost


	Pension Benefits									Other Benefits
(In thousands)	2012			2011			2010			2012			2011			2010
Components of Net Periodic Benefit (Credit) Cost
Service cost	$	9,511		$	8,674		$	7,702		$	694		$	785		$	763
Interest cost		19,018			19,531			18,615			1,265			1,501			1,730
Expected return on plan assets		(32,328	)		(34,125	)		(34,565	)		—			—			—
Amortization of transition amounts		2			4			4			—			—			—
Amortization of prior service cost		101			104			103			529			710			840
Recognized net actuarial losses (gains)		6,235			793			537			(454	)		(455	)		(555	)
Curtailment loss		747			52			287			—			—			—
Termination benefits		387			—			926			—			—			—

Net periodic benefit cost (credit)		3,673			(4,967	)		(6,391	)		2,034			2,541			2,778

Schedule Of Amounts Included In Accumulated Other Comprehensive Income Expected To Be Recognized In Net Periodic Benefit Costs

Amounts included in accumulated other comprehensive income expected to be recognized in 2013 net periodic benefit costs.


(In thousands)	Pension Benefits		Other Benefits
Loss recognition	$	14,149	$	676
Prior service cost (credit) recognition		102		(425	)
Transition obligation recognition		3		—

Schedule Of Assumptions Used To Determine Benefit Obligations And Net Periodic Benefit Cost


	Pension Benefits						Other Benefits
	2012			2011			2012			2011
Assumptions used to determine benefit obligations
Discount rate		4.0	%		5.0	%		3.8	%		4.8	%
Rate of compensation increase		3.8	%		3.9	%		—			—
Assumptions used to determine net periodic benefit cost
Discount rate		5.0	%		5.6	%		4.8	%		5.3	%
Expected return on plan assets		8.2	%		8.3	%		—			—
Rate of compensation increases		3.9	%		3.7	%		—			—

Schedule Of Expected Return On Assets For Net Periodic Pension Cost


	Pension Plan Assets at December 31,
	2012			2011
Equity securities		64	%		60	%
Fixed income securities		25			29
Pooled investment funds		6			6
Insurance contracts		3			3
Cash and cash equivalents		2			2

Total		100	%		100	%

Summary Of Pension Plan Assets Measured At Fair Value On A Recurring Basis By Fair Value Hierarchy

The following table summarizes our pension plan assets measured at fair value on a recurring basis by fair value hierarchy level (See Note 17):


	December 31, 2012
(In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
Equity securities	$	245,840	$	—	$	—	$	245,840
Fixed income securities		43,600		52,762		—		96,362
Pooled investment funds		—		22,030		—		22,030
Insurance contracts		—		—		12,254		12,254
Cash and cash equivalents		7,966		—		—		7,966

Total		297,406		74,792		12,254		384,452


	December 31, 2011
(In thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
Equity securities	$	216,198	$	—	$	—	$	216,198
Fixed income securities		34,636		68,087		—		102,723
Pooled investment funds		—		19,765		—		19,765
Insurance contracts		—		—		11,562		11,562
Cash and cash equivalents		7,719		—		—		7,719

Total		258,553		87,852		11,562		357,967

Schedule Of Reconciliation Of Level 3 Assets

The following table presents a reconciliation of Level 3 assets:


(In thousands)	Insurance Contracts
Balance January 1, 2011	$	10,725
Net realized and unrealized losses included in earnings		(325	)
Net purchases, issuances and settlements		1,162

Balance December 31, 2011		11,562
Net realized and unrealized gains included in earnings		1,933
Net purchases, issuances and settlements		(1,241	)

Balance December 31, 2012		12,254

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 4, 7, 16, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Other Income, Net (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Other Income, Net


(In thousands)	2012			2011		2010
Interest income	$	1,525		$	1,861	$	1,979
Gain on asset dispositions, net		8,396			3,328		5,135
Escrow settlement (See Note 16)		4,790			—		—
Intangible asset impairment loss (See Note 10)		(4,272	)		—		—
Other, net		552			192		(1,077	)

Total		10,991			5,381		6,037

Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Balance Sheet Location And Fair Value Of Assets And Liabilities Associated With Derivative Financial Instruments

The following table presents the balance sheet location and fair value of assets and liabilities associated with derivative financial instruments.


	December 31,
(In thousands)	2012		2011
Derivatives not designated as hedging instruments
Foreign exchange contracts:
Prepaid expenses and other current assets	$	801	$	—
Other current liabilities		—		50

Income Statement Location and Impact of Derivative Financial Instruments

The following table presents the income statement location and impact of derivative financial instruments:

(In thousands)

Income Statement
Location

(Gain) Loss
Recognized in Income

Year ended
December 31,

2012

2011

Derivatives not designated as hedging instruments

Foreign exchange contracts

Currency exchange

losses, net

(1,139

)

1,282

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References + Details

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2012

Fair Values of Assets Acquired and Liabilities Assumed

The following table summarizes the fair values of the General Monitors assets acquired and liabilities assumed at the date of acquisition:


(In millions)	October 13, 2010
Current assets (including cash of $18.6 million)	$	46.8
Property		14.0
Trade name		6.0
Acquired technology		11.0
Customer-related intangibles		27.0
Goodwill		179.9
Other noncurrent assets		3.5

Total assets acquired		288.2
Total liabilities assumed		10.0

Net assets acquired		278.2

Pro Forma Financial Information

Pro forma financial information (Unaudited)


	Year Ended December 31
(In millions, except per share amounts)	2011		2010
Net sales	$	1,173	$	1,032
Net income		71		50
Basic earnings per share		1.95		1.39
Diluted earnings per share		1.92		1.37

- Definition

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

+ References + Details

Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Cumulative Trauma Product Liability Claims Activity

A summary of cumulative trauma product liability claims activity follows:


	2012			2011			2010
Open claims, January 1		2,321			1,900			2,480
New claims		750			479			260
Settled and dismissed claims		(462	)		(58	)		(840	)

Open claims, December 31		2,609			2,321			1,900

Summary of Insurance Receivable Balances and Activity Related to Cumulative Trauma Product Liability Losses

A summary of insurance receivable balances and activity related to cumulative trauma product liability losses follows:


(In millions)	2012			2011			2010
Balance January 1	$	112.1		$	89.0		$	91.7
Additions		29.7			35.6			30.9
Collections and settlements		(11.8	)		(12.5	)		(33.6	)

Balance December 31		130.0			112.1			89.0

- Definition

Tabular disclosure of exposure to material amount of loss arising from allegations of damages pertaining to and arising from one or more of the entity's products.

+ References + Details

Assets Held for Sale (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Assets Held for Sale

These assets are reported in the following balance sheet lines:


(In millions)	December 31, 2012
Inventory	$	2.0
Property, net of depreciation		0.3

Total assets		2.3

Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Quarterly Financial Information


	2012
	Quarters								Year
(In thousands, except earnings per share)	1st		2nd		3rd		4th		Year
Net sales	$	293,485	$	294,738	$	286,567	$	294,114	$	1,168,904
Gross profit		126,991		123,126		122,254		130,361		502,732
Net income attributable to Mine Safety Appliances Company		23,922		27,995		19,233		19,487		90,637
Earnings per share attributable to Mine Safety Appliances Company shareholders:
Basic		.65		.76		.52		.53		2.45
Diluted		.64		.75		.51		.52		2.42


	2011
	Quarters								Year
(In thousands, except earnings per share)	1st		2nd		3rd		4th		Year
Net sales	$	276,499	$	294,733	$	298,241	$	303,754	$	1,173,227
Gross profit		110,397		119,009		120,888		119,942		470,236
Net income attributable to Mine Safety Appliances Company		13,309		19,592		19,972		16,979		69,852
Earnings per share attributable to Mine Safety Appliances Company shareholders:
Basic		.36		.53		.54		.46		1.91
Diluted		.36		.53		.54		.46		1.87

Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant Accounting Policies [Line Items]
Depreciation expense	$ 27.5	$ 27.1	$ 25.5
Building \| Minimum
Significant Accounting Policies [Line Items]
Useful Lives	20 years
Building \| Maximum
Significant Accounting Policies [Line Items]
Useful Lives	40 years
Machinery and Equipment \| Minimum
Significant Accounting Policies [Line Items]
Useful Lives	3 years
Machinery and Equipment \| Maximum
Significant Accounting Policies [Line Items]
Useful Lives	10 years

Restructuring and Other Charges - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 2,787	$ 8,559	$ 14,121
European Segment
Restructuring Cost and Reserve [Line Items]
Severance costs	1,100
Staff reductions charges		5,800
Voluntary retirement incentive program			8,800
North American Segment
Restructuring Cost and Reserve [Line Items]
Severance costs	1,500
Costs associated with the relocation of certain administrative and production activities		1,700	3,800
International Segment
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 200	$ 1,100	$ 1,500

- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.P.3)
-URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5-8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 146
-Paragraph 8-13, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS146-1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 112
-Paragraph 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Schedule Of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Finished products	$ 72,658	$ 65,687
Work in process	13,473	17,000
Raw materials and supplies	50,169	58,788
Total inventories	136,300	141,475
Excess of FIFO costs over LIFO costs	46,519	47,368
Total FIFO inventories	$ 182,819	$ 188,843

Inventories - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Schedule of Inventory [Line Items]
Percentage of LIFO inventories on total inventories	16.00%	18.00%
Effect of LIFO liquidation on cost of sales	$ 0.8	$ 0.5
Increase in income due to effect of liquidations	$ 0.5	$ 0.3

Capital Stock - Additional Information (Detail) - USD ($)	36 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Capital Unit [Line Items]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	180,000,000
Preferred stock, par value	$ 50	$ 50
Percentage of cumulative preferred stock	4.50%	4.50%
Treasury stock value	$ 269,739,000	$ 266,231,000
Second Cumulative Preferred Voting Stock
Capital Unit [Line Items]
Preferred stock, par value	$ 10
Preferred stock, shares authorized	1,000,000
Preferred stock, shares issued	0
4 1/2% Cumulative Preferred Nonvoting Stock
Capital Unit [Line Items]
Preferred stock, par value	$ 50
Preferred stock, shares authorized	100,000
Preferred stock, shares issued	71,373
Percentage of cumulative preferred stock	4.50%
Treasury share, number of shares held	52,878
Treasury stock value	$ 1,800,000
Purchase of treasury shares	$ 0

Summary of Common Stock Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted stock expense	$ 4,744	$ 4,370	$ 4,063
Stock option expense	$ 2,435	$ 2,343	$ 2,748
Common Stock
Beginning Balances (in shares)	62,081,391	62,081,391	62,081,391
Ending Balances (in shares)	62,081,391	62,081,391	62,081,391
Beginning Balances	$ 97,276	$ 88,629	$ 74,269
Restricted stock awards	(711)	(542)	(850)
Restricted stock expense	4,891	4,376	4,103
Restricted stock forfeitures	(147)	(6)	(40)
Stock options exercised	3,141	825	4,413
Stock option expense	2,435	2,343	2,748
Performance stock issued	(303)
Performance stock expense	2,831	1,019	524
Tax benefit related to stock plans	2,799	632	3,462
Other, net	(77)
Ending Balances	$ 112,135	$ 97,276	$ 88,629
Stock Compensation Trust
Beginning Balances (in shares)	(1,162,784)	(1,360,714)	(2,174,204)
Restricted stock awards (in shares)	136,295	103,815	162,925
Stock options exercised (in shares)	223,022	94,115	650,565
Performance stock issued	58,037
Ending Balances (in shares)	(745,430)	(1,162,784)	(1,360,714)
Beginning Balances	$ (6,070)	$ (7,103)	$ (11,349)
Restricted stock awards	711	542	850
Stock options exercised	1,165	491	3,396
Performance stock issued	303
Ending Balances	$ (3,891)	$ (6,070)	$ (7,103)
Treasury Stock
Beginning Balances (in shares)	(24,226,017)	(24,200,951)	(23,934,669)
Restricted stock forfeitures (in shares)	(10,815)	(7,469)	(1,092)
Treasury shares purchased (in shares)	(91,330)	(17,597)	(265,190)
Ending Balances (in shares)	(24,328,162)	(24,226,017)	(24,200,951)
Beginning Balances	$ (264,479)	$ (263,855)	$ (256,283)
Treasury shares purchased	(3,508)	(624)	(7,572)
Ending Balances	$ (267,987)	$ (264,479)	$ (263,855)

Segment Information - Additional Information (Detail)	12 Months Ended
Segment Information - Additional Information (Detail)	Dec. 31, 2012 Segment
Segment Reporting Information [Line Items]
Number of geographic operating segments	11
Number of reportable segments	3

Schedule Of Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Sales to external customers	$ 294,114	$ 286,567	$ 294,738	$ 293,485	$ 303,754	$ 298,241	$ 294,733	$ 276,499	$ 1,168,904	$ 1,173,227	$ 976,631
Net income attributable to Mine Safety Appliances Company	19,487	$ 19,233	$ 27,995	$ 23,922	16,979	$ 19,972	$ 19,592	$ 13,309	90,637	69,852	38,104
Total assets	1,111,746				1,115,052				1,111,746	1,115,052	1,197,188
Interest income									1,525	1,861	1,979
Interest expense									11,361	14,117	8,707
Noncash items:
Depreciation and amortization									31,702	32,866	29,192
Pension income (expense)									(3,673)	4,967	6,391
Income tax provision									42,529	34,773	18,290
Capital expenditures									32,209	30,390	25,024
Long-lived assets	186,113				192,882				186,113	192,882	210,669
North America
Segment Reporting Information [Line Items]
Sales to external customers									551,927	561,140	464,012
Intercompany sales									114,354	100,094	84,905
Net income attributable to Mine Safety Appliances Company									70,930	57,914	44,560
Total assets	726,476				742,707				726,476	742,707	810,345
Interest income									364	78	329
Interest expense									106	29	51
Noncash items:
Depreciation and amortization									21,446	22,036	18,918
Pension income (expense)									2,138	10,800	13,451
Income tax provision									42,480	34,327	22,032
Capital expenditures									20,129	20,035	16,806
Long-lived assets	119,642				127,361				119,642	127,361	142,241
Europe
Segment Reporting Information [Line Items]
Sales to external customers									289,549	286,753	251,107
Intercompany sales									98,096	116,471	92,526
Net income attributable to Mine Safety Appliances Company									12,913	7,331	(5,371)
Total assets	352,601				340,305				352,601	340,305	336,095
Interest income									147	192	110
Interest expense									350	253	160
Noncash items:
Depreciation and amortization									5,354	6,239	6,116
Pension income (expense)									(4,700)	(5,638)	(6,590)
Income tax provision									4,858	3,994	769
Capital expenditures									5,106	4,384	4,667
Long-lived assets	29,882				29,981				29,882	29,981	33,199
International
Segment Reporting Information [Line Items]
Sales to external customers									327,428	325,334	261,512
Intercompany sales									18,641	18,305	16,410
Net income attributable to Mine Safety Appliances Company									22,318	27,152	15,835
Total assets	205,959				194,127				205,959	194,127	205,837
Interest income									1,000	1,267	1,212
Interest expense									95	138	100
Noncash items:
Depreciation and amortization									4,902	4,591	4,158
Pension income (expense)									(1,111)	(195)	(470)
Income tax provision									9,214	6,442	5,720
Capital expenditures									6,974	5,971	3,551
Long-lived assets	36,589				35,540				36,589	35,540	35,229
Reconciling Items
Segment Reporting Information [Line Items]
Intercompany sales									(231,091)	(234,870)	(193,841)
Net income attributable to Mine Safety Appliances Company									(15,524)	(22,545)	(16,920)
Total assets	$ (173,290)				$ (162,087)				(173,290)	(162,087)	(155,089)
Interest income									14	324	328
Interest expense									10,810	13,697	8,396
Noncash items:
Income tax provision									$ (14,023)	$ (9,990)	$ (10,231)

Geographic Information on Sales to External Customers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers	$ 294,114	$ 286,567	$ 294,738	$ 293,485	$ 303,754	$ 298,241	$ 294,733	$ 276,499	$ 1,168,904	$ 1,173,227	$ 976,631
UNITED STATES
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers									527,550	538,257	447,029
GERMANY
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers									74,557	75,536	77,858
Other Country
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers									$ 566,797	$ 559,434	$ 451,744

Geographic Information on Long-lived Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 186,113	$ 192,882	$ 210,669
UNITED STATES
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	116,539	124,035	139,161
Germany
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	8,781	9,425	10,570
Other Country
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 60,793	$ 59,422	$ 60,938

Schedule Of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Net income attributable to Mine Safety Appliances Company	$ 19,487	$ 19,233	$ 27,995	$ 23,922	$ 16,979	$ 19,972	$ 19,592	$ 13,309	$ 90,637	$ 69,852	$ 38,104
Preferred stock dividends									(42)	(42)	(42)
Income available to common equity									90,595	69,810	38,062
Dividends and undistributed earnings allocated to participating securities									(865)	(755)	(365)
Income available to common shareholders									$ 89,730	$ 69,055	$ 37,697
Basic earnings per common share	$ 0.53	$ 0.52	$ 0.76	$ 0.65	$ 0.46	$ 0.54	$ 0.53	$ 0.36	$ 2.45	$ 1.91	$ 1.06
Diluted earnings per common share	$ 0.52	$ 0.51	$ 0.75	$ 0.64	$ 0.46	$ 0.54	$ 0.53	$ 0.36	$ 2.42	$ 1.87	$ 1.05
Basic shares outstanding									36,564	36,221	35,880
Stock options and other stock compensation									478	610	542
Diluted shares outstanding									37,042	36,831	36,422
Antidilutive stock options									744	894	760

Components of Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of income before income taxes
U.S. income	$ 67,041	$ 58,817	$ 38,398
Non-U.S. income	67,249	46,001	18,951
Income before income taxes	134,290	104,818	57,349
Federal	18,774	6,829	9,498
State	2,556	872	149
Non-U.S.	20,986	18,272	1,481
Total current provision	42,316	25,973	11,128
Federal	(518)	10,853	3,862
State	(125)	772	194
Non-U.S.	856	(2,825)	3,106
Total deferred provision	213	8,800	7,162
Provision for income taxes	$ 42,529	$ 34,773	$ 18,290

Reconciliation Between U.S. Federal Income Tax Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Statutory Federal Tax Rate [Line Items]
U.S. federal income tax rate	35.00%	35.00%	35.00%
State income taxes-U.S.	1.20%	1.00%	0.40%
Taxes on non-U.S. income	(1.40%)	(2.10%)	(0.80%)
Research and development credit		(1.30%)	(2.30%)
Manufacturing deduction credit	(1.90%)	(0.30%)	(1.90%)
Valuation allowances	(0.20%)	0.10%	2.00%
Other	(1.00%)	0.80%	(0.50%)
Effective income tax rate	31.70%	33.20%	31.90%

Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Schedule of Components of Deferred Tax Provision [Line Items]
Book expenses capitalized for tax	$ 8,213
Postretirement benefits	19,282	$ 13,561
Inventory reserves	4,780	3,773
Vacation allowances	1,240	1,319
Net operating losses and tax credit carryforwards	7,558	9,436
Post employment benefits	1,006	2,400
Foreign tax credit carryforwards (expiring in 2019)	212	3,463
Stock options	9,672	7,815
Liability insurance	2,754	4,116
Basis of capital assets	1,013	1,102
Warranties	3,078	2,903
Reserve for doubtful accounts	1,547	1,581
Deferred revenue	261	217
Other	4,014	3,788
Total deferred tax assets	64,630	55,474
Valuation allowances	(3,961)	(2,777)
Net deferred tax assets	60,669	52,697
Property, plant and equipment	(10,547)	(13,565)
Pension	(10,915)	(18,609)
Intangibles	(21,492)	(16,209)
Other	(322)	(973)
Total deferred tax liabilities	(43,276)	(49,356)
Net deferred taxes	$ 17,393	$ 3,341

Components of Deferred Tax Assets and Liabilities (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012
Foreign
Schedule of Components of Deferred Tax Provision [Line Items]
Foreign tax credit carryforwards, expiration date	2019

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Net operating loss carryforwards	$ 30.4
Deferred income taxes on undistributed earnings	0.0
Undistributed earnings of non-U.S. subsidiaries	258.0
Recognized tax benefits	8.6	$ 11.4
Liability for interest expense and penalties accrued	0.7	$ 0.9
Accrued additional interest and penalties related to uncertain tax positions	(0.2)
Expiration Date Two Thousand Fourteen
Income Taxes [Line Items]
Net operating loss carryforward expiring	$ 0.2
Net operating loss carryforwards expiration year	2014
Expiration Date Two Thousand Fifteen
Income Taxes [Line Items]
Net operating loss carryforwards expiration year	2015
Net operating loss carryforward expiring	$ 0.9
Expiration Date Two Thousand Sixteen
Income Taxes [Line Items]
Net operating loss carryforwards expiration year	2016
Net operating loss carryforward expiring	$ 0.1

Reconciliation of Change in Tax Liability for Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning balance	$ 12,827	$ 11,827
Adjustments for tax positions related to the current year	(2,672)	1,268
Adjustments for tax positions related to prior years	(367)	(9)
Statute expiration	(268)	(259)
Ending balance	$ 9,520	$ 12,827

Stock Plans - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2012 USD ($) yr shares	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expiration period	10 years
Stock options exercisable period after grant date	3 years
Restricted stock vest period after grant date	3 years
Number of tranches in which restricted stock is vested \| yr	3
Restricted stock for management retention awards with various vesting periods, first tranche	4 years
Restricted stock for management retention awards with various vesting periods, second tranche	5 years
Restricted stock for management retention awards with various vesting periods, third tranche	6 years
Cash proceeds from exercise of options	$ 4,306	$ 1,316	$ 7,809
Excess tax benefit (provision) related to stock plans	2,799	632	3,462
Aggregate intrinsic value of stock options exercisable	9,000
Aggregate intrinsic value of stock options outstanding	17,200
Total intrinsic value of stock options exercised	4,400	1,800	10,900
Unrecognized stock-based compensation expense	$ 5,500
Weighted average period over which unrecognized stock-based compensation expense is expected to be recognized, in years	1 year
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award based on achieving targeted performance conditions	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award based on achieving targeted performance conditions	200.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefit (provision) related to stock plans	$ 1,600	700	4,300
Restricted Stock Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock units vested	8,000	$ 2,600	$ 1,200
Performance Stock Unit Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock units vested	$ 1,900
Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future grants \| shares	2,052,924
Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future grants \| shares	207,952

Schedule of Stock Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Restricted stock	$ 4,744	$ 4,370	$ 4,063
Stock options	2,435	2,343	2,748
Performance stock	2,831	1,019	524
Total compensation expense before income taxes	10,010	7,732	7,335
Income tax benefit	3,700	2,825	2,653
Total compensation expense, net of income tax benefit	$ 6,310	$ 4,907	$ 4,682

Weighted Average Assumptions and Fair Value of Stock Option Grants (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per option	$ 10.77	$ 9.94	$ 7.21
Risk-free interest rate	1.20%	2.60%	3.00%
Expected dividend yield	3.10%	3.60%	3.90%
Expected volatility	41.00%	40.00%	40.00%
Expected life (years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days

Summary of Stock Option Activity (Detail) - $ / shares	12 Months Ended
Summary of Stock Option Activity (Detail) - $ / shares	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Beginning balance,Shares	1,818,640	1,749,003	2,085,075
Granted, Shares	196,469	166,247	323,978
Exercised, Shares	(223,022)	(94,115)	(650,565)
Expired, Shares	(5,093)	(2,495)	(9,485)
Forfeited, Shares	(2,334)
Outstanding Ending balance,Shares	1,784,660	1,818,640	1,749,003
Outstanding Beginning balance, Weighted Average Exercise Price	$ 30.94	$ 29.74	$ 25.01
Granted, Weighted Average Exercise Price	37.33	34.09	25.06
Exercised, Weighted Average Exercise Price	18.93	13.99	12.00
Expired, Weighted Average Exercise Price	43.33	44.08	46.73
Forfeited, Weighted Average Exercise Price	36.69
Outstanding Ending balance,Weighted Average Exercise Price	$ 33.05	$ 30.94	$ 29.74
Exercisable at end of period	1,100,300	907,598	791,759

Schedule of Exercise Price Ranges, Characteristics of Outstanding Stock Options (Detail)	12 Months Ended
	Dec. 31, 2012 $ / shares shares
$10.65 - $21.71
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 10.65
Range of Exercise Prices, maximum	$ 21.71
Stock Options Outstanding, Shares \| shares	357,569
Stock Options Outstanding, Weighted-Average Exercise Price	$ 18.03
Stock Options Outstanding, Weighted-Average Remaining Life, in years	6 years
$24.63 - $37.33
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 24.63
Range of Exercise Prices, maximum	$ 37.33
Stock Options Outstanding, Shares \| shares	683,185
Stock Options Outstanding, Weighted-Average Exercise Price	$ 30.21
Stock Options Outstanding, Weighted-Average Remaining Life, in years	7 years 8 months 12 days
$40.08 - $50.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 40.08
Range of Exercise Prices, maximum	$ 50.25
Stock Options Outstanding, Shares \| shares	743,906
Stock Options Exercisable, Shares \| shares	722,506
Stock Options Outstanding, Weighted-Average Exercise Price	$ 42.88
Exercisable, Weighted-Average Exercise Price	$ 42.89
Stock Options Outstanding, Weighted-Average Remaining Life, in years	3 years 4 months 24 days
Stock Options Exercisable, Weighted-Average Remaining Life, in years	3 years 2 months 12 days
$10.65 - $13.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 10.65
Range of Exercise Prices, maximum	$ 13.57
Stock Options Exercisable, Shares \| shares	328,445
Exercisable, Weighted-Average Exercise Price	$ 17.70
Stock Options Exercisable, Weighted-Average Remaining Life, in years	6 years
$25.07 - $28.06
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 25.07
Range of Exercise Prices, maximum	$ 28.06
Stock Options Exercisable, Shares \| shares	49,349
Exercisable, Weighted-Average Exercise Price	$ 23.27
Stock Options Exercisable, Weighted-Average Remaining Life, in years	4 years 2 months 12 days
$10.65 - $50.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 10.65
Range of Exercise Prices, maximum	$ 50.25
Stock Options Outstanding, Shares \| shares	1,784,660
Stock Options Exercisable, Shares \| shares	1,100,300
Stock Options Outstanding, Weighted-Average Exercise Price	$ 33.05
Exercisable, Weighted-Average Exercise Price	$ 34.49
Stock Options Outstanding, Weighted-Average Remaining Life, in years	5 years 7 months 6 days
Stock Options Exercisable, Weighted-Average Remaining Life, in years	4 years 1 month 6 days

Summary of Restricted Stock Activity (Detail) - Restricted Stock Activity - $ / shares	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Shares, Beginning Balance	512,254	473,637	338,206
Granted, Shares	130,985	125,603	185,216
Vested, Shares	(209,897)	(76,505)	(46,125)
Forfeited, Shares	(15,499)	(10,481)	(3,660)
Unvested Shares, Ending Balance	417,843	512,254	473,637
Unvested Weighted Average Grant Date Fair value, Beginning Balance	$ 25.66	$ 26.56	$ 28.99
Granted, Weighted Average Grant Date Fair Value	37.61	33.61	25.38
Vested, Weighted Average Grant Date Fair Value	20.44	44.39	39.88
Forfeited, Weighted Average Grant Date Fair value	28.37	24.87	23.93
Unvested Weighted Average Grant Date Fair value, Ending Balance	$ 31.92	$ 25.66	$ 26.56

Summary of Performance Stock Unit Activity (Detail) - Performance Stock Unit Activity - $ / shares	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Shares, Beginning Balance	125,443	85,629	61,974
Granted, Shares	54,928	48,820	41,984
Vested, Shares	(47,706)
Performance adjustments, Shares	5,679	(7,506)	(18,329)
Forfeited, Shares	(672)	(1,500)
Unvested Shares, Ending Balance	137,672	125,443	85,629
Unvested Weighted Average Grant Date Fair value, Beginning Balance	$ 25.27	$ 20.53	$ 17.83
Granted, Weighted Average Grant Date Fair Value	41.33	33.09	24.63
Vested, Weighted Average Grant Date Fair Value	18.23
Performance adjustments, Weighted Average Grant Date Fair value	26.39	21.14	20.75
Forfeited, Weighted Average Grant Date Fair value	41.45	30.53
Unvested Weighted Average Grant Date Fair value, Ending Balance	$ 35.85	$ 25.27	$ 20.53

Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Senior revolving credit facility maturing in 2016	$ 115,000	$ 170,000
Total	279,000	342,046
Amounts due within one year	6,667	8,000
Long-term debt	272,333	334,046
Industrial Development Debt Issues Payable Through 2022, 0.30%
Debt Instrument [Line Items]
Industrial development debt issues payable through 2022, 0.30%	4,000	4,000
Senior Notes Payable Through 2012, 8.39%
Debt Instrument [Line Items]
Senior Notes payable		8,046
Senior Notes Payable Through 2021, 5.41%
Debt Instrument [Line Items]
Senior Notes payable	60,000	60,000
Senior Notes Payable Through 2021, 4.00%
Debt Instrument [Line Items]
Senior Notes payable	$ 100,000	$ 100,000

Schedule of Outstanding Debt (Parenthetical) (Detail)	12 Months Ended
Schedule of Outstanding Debt (Parenthetical) (Detail)	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Debt instruments maturity date	2016	2016
Industrial Development Debt Issues Payable Through 2022, 0.30%
Debt Instrument [Line Items]
Debt instruments maturity date	2022	2022
Senior Notes, interest rate	0.30%	0.30%
Senior Notes Payable Through 2012, 8.39%
Debt Instrument [Line Items]
Debt instruments maturity date	2012	2012
Senior Notes, interest rate	8.39%	8.39%
Senior Notes Payable Through 2021, 5.41%
Debt Instrument [Line Items]
Debt instruments maturity date	2021	2021
Senior Notes, interest rate	5.41%	5.41%
Senior Notes Payable Through 2021, 4.00%
Debt Instrument [Line Items]
Debt instruments maturity date	2021	2021
Senior Notes, interest rate	4.00%	4.00%

Long-Term Debt - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2012 USD ($)
Debt Instrument [Line Items]
Unsecured senior revolving credit facility	$ 300.0
Unsecured senior revolving credit facility, maturity date	Nov. 01, 2016
Increase in the senior credit facility	$ 50.0
Unused senior revolving credit facility	185.0
Maturity obligation, 2013	6.7
Maturity obligation, 2014	6.7
Maturity obligation, 2015	6.7
Maturity obligation, 2016	121.7
Maturity obligation, 2017	26.7
Maturity obligation, thereafter	$ 110.5

Schedule of Changes in Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Intangible Assets [Abstract]
Net balance at January 1	$ 259,084	$ 263,089
Disposals	(1,800)	(1,800)
Currency translation	1,116	(2,205)
Net balance at December 31	$ 258,400	$ 259,084

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 258,400	$ 259,084	$ 263,089
Intangible assets totaled	38,600
Intangible assets, accumulated amortization	28,300
Impairment loss recognized	4,300
Disposals of goodwill	1,800
Disposal of intangible assets	500
Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Future amortization expense, 2013	3,700
Future amortization expense, 2014	3,700
Future amortization expense, 2015	3,700
Future amortization expense, 2016	3,500
Future amortization expense, 2017	3,100
North American
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	196,500
European
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	59,200
International
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,700

Schedule of Changes in Intangible Assets, Net of Accumulated Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Intangible Assets [Abstract]
Net balance at January 1	$ 47,119	$ 53,880
Amortization expense	(4,181)	(5,728)
Disposals		(518)
Impairment losses	(4,272)
Currency translation	(18)	(515)
Net balance at December 31	$ 38,648	$ 47,119

Schedule of Defined Benefit Pension Plans and Other Postretirement Benefits Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Change in Plan Assets
Fair value of plan assets at January 1	$ 357,967
Fair value of plan assets at December 31	384,452	$ 357,967
Funded Status
Amounts Recognized in the Balance Sheet Noncurrent assets	42,818	58,075
Noncurrent liabilities	(151,536)	(124,310)
Pension Benefits
Change in Benefit Obligations
Service cost	9,511	8,674	$ 7,702
Interest cost	19,018	19,531	18,615
Actuarial losses (gains)	(6,235)	(793)	(537)
Termination benefits	(387)		(926)
Funded Status
Funded status at December 31	(79,354)	(36,302)
Unrecognized transition losses	24	24
Unrecognized prior service cost	712	808
Unrecognized net actuarial losses	198,169	158,425
Net amount recognized	119,551	122,955
Amounts Recognized in the Balance Sheet Noncurrent assets	42,818	58,075
Current liabilities	(5,021)	(4,722)
Noncurrent liabilities	(117,151)	(89,655)
Net amount recognized	(79,354)	(36,302)
Amounts Recognized in Accumulated Other Comprehensive Income
Net actuarial losses	198,169	158,425
Prior service cost (credit)	712	808
Unrecognized net initial obligation	24	24
Total (before tax effects)	198,905	159,257
Accumulated Benefit Obligations for all Defined Benefit Plans	414,957	347,636
Pension Benefits \| Benefit Obligations
Change in Benefit Obligations
Benefit obligations at January 1	394,269	349,755
Service cost	9,511	8,674
Interest cost	19,018	19,531
Participant contributions	137	153
Actuarial losses (gains)	58,102	37,973
Benefits paid	(17,804)	(18,931)
Curtailments		(54)
Settlements	(2,542)
Termination benefits	387
Currency translation	2,728	(2,832)
Benefit obligations at December 31	463,806	394,269	349,755
Change in Plan Assets
Settlements	2,542
Benefits paid	17,804	18,931
Currency translation	(2,728)	2,832
Pension Benefits \| Plan Assets
Change in Benefit Obligations
Benefits paid	15,198	16,308
Settlements	2,542
Currency translation	(768)	694
Change in Plan Assets
Fair value of plan assets at January 1	357,967	377,607
Actual return on plan assets	41,478	(4,428)
Employer contributions	4,448	4,259
Participant contributions	137	153
Settlements	(2,542)
Benefits paid	(15,198)	(16,308)
Reimbursement of German benefits	(2,606)	(2,622)
Currency translation	768	(694)
Fair value of plan assets at December 31	384,452	357,967	377,607
Other Benefits
Change in Benefit Obligations
Service cost	694	785	763
Interest cost	1,265	1,501	1,730
Actuarial losses (gains)	454	455	555
Funded Status
Funded status at December 31	(30,551)	(30,425)
Unrecognized prior service cost	(2,618)	(3,072)
Unrecognized net actuarial losses	11,492	12,212
Net amount recognized	(21,677)	(21,285)
Current liabilities	(1,882)	(2,096)
Noncurrent liabilities	(28,669)	(28,329)
Net amount recognized	(30,551)	(30,425)
Amounts Recognized in Accumulated Other Comprehensive Income
Net actuarial losses	11,492	12,212
Prior service cost (credit)	(2,618)	(3,072)
Total (before tax effects)	8,874	9,140
Other Benefits \| Benefit Obligations
Change in Benefit Obligations
Benefit obligations at January 1	30,425	32,734
Service cost	694	785
Interest cost	1,265	1,501
Actuarial losses (gains)	(191)	(2,281)
Benefits paid	(1,642)	(2,314)
Benefit obligations at December 31	30,551	30,425	$ 32,734
Change in Plan Assets
Benefits paid	1,642	2,314
Other Benefits \| Plan Assets
Change in Benefit Obligations
Benefits paid	1,864	2,559
Change in Plan Assets
Employer contributions	1,642	2,314
Participant contributions	222	245
Benefits paid	$ (1,864)	$ (2,559)

Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9,511	$ 8,674	$ 7,702
Interest cost	19,018	19,531	18,615
Expected return on plan assets	(32,328)	(34,125)	(34,565)
Amortization of transition amounts	2	4	4
Amortization of prior service cost	101	104	103
Recognized net actuarial losses (gains)	6,235	793	537
Curtailment loss	747	52	287
Termination benefits	387		926
Net periodic benefit cost (credit)	3,673	(4,967)	(6,391)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	694	785	763
Interest cost	1,265	1,501	1,730
Amortization of prior service cost	529	710	840
Recognized net actuarial losses (gains)	(454)	(455)	(555)
Net periodic benefit cost (credit)	$ 2,034	$ 2,541	$ 2,778

Schedule of Amounts Included in Accumulated Other Comprehensive Income Expected To Be Recognized In Net Periodic Benefit Costs (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2012 USD ($)
Pension Benefits
Schedule of Pension and Other Postretirement Benefits Recognized in Accumulated Other Comprehensive Income (Loss) [Line Items]
Loss recognition	$ 14,149
Prior service cost (credit) recognition	102
Transition obligation recognition	3
Other Benefits
Schedule of Pension and Other Postretirement Benefits Recognized in Accumulated Other Comprehensive Income (Loss) [Line Items]
Loss recognition	676
Prior service cost (credit) recognition	$ (425)

Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, Discount rate	4.00%	5.00%
Assumptions used to determine benefit obligations, Rate of compensation increase	3.80%	3.90%
Assumptions used to determine net periodic benefit cost, Discount rate	5.00%	5.60%
Assumptions used to determine net periodic benefit cost, Expected return on plan assets	8.20%	8.30%
Assumptions used to determine net periodic benefit cost, Rate of compensation increases	3.90%	3.70%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, Discount rate	3.80%	4.80%
Assumptions used to determine net periodic benefit cost, Discount rate	4.80%	5.30%

Schedule of Expected Return on Assets for Net Periodic Pension Cost (Detail)	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total	64.00%	60.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Total	25.00%	29.00%
Pooled Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Total	6.00%	6.00%
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total	3.00%	3.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total	2.00%	2.00%

Summary of Pension Plan Assets Measured at Fair Value on Recurring Basis by Fair Value Hierarchy (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	$ 384,452	$ 357,967
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	245,840	216,198
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	96,362	102,723
Pooled Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	22,030	19,765
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	12,254	11,562
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	7,966	7,719
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	297,406	258,553
Fair Value, Inputs, Level 1 \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	245,840	216,198
Fair Value, Inputs, Level 1 \| Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	43,600	34,636
Fair Value, Inputs, Level 1 \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	7,966	7,719
Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	74,792	87,852
Fair Value, Inputs, Level 2 \| Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	52,762	68,087
Fair Value, Inputs, Level 2 \| Pooled Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	22,030	19,765
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	12,254	11,562
Fair Value, Inputs, Level 3 \| Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets measured at fair value	$ 12,254	$ 11,562	$ 10,725

Schedule of Reconciliation of Level Three Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	$ 357,967
Fair value of plan assets at December 31	384,452	$ 357,967
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	11,562
Fair value of plan assets at December 31	12,254	11,562
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	11,562
Fair value of plan assets at December 31	12,254	11,562
Fair Value, Inputs, Level 3 \| Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	11,562	10,725
Net realized and unrealized losses included in earnings	1,933	(325)
Net purchases, issuances and settlements	(1,241)	1,162
Fair value of plan assets at December 31	$ 12,254	$ 11,562

- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References + Details

Pensions and Other Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Estimated contributions by employer to pension plans	$ 7.2
Percentage increase in health care benefits cost	8.30%
Percentage decrease in health care benefits for successive year	0.50%
Estimated future percentage of health care benefits	4.50%
Percentage of change in assumed health care cost trend rate	1.00%
Increase or decrease in other postretirement obligations	$ 1.8
Increase or decrease in current year plan expense	1.6
Expense for defined contribution pension plans	5.9	$ 5.7	$ 5.2
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated benefit payments, 2013	20.2
Estimated benefit payments, 2014	19.8
Estimated benefit payments, 2015	20.5
Estimated benefit payments, 2016	21.0
Estimated benefit payments, 2017	22.2
Estimated benefit payments, thereafter	127.8
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated benefit payments, 2013	1.9
Estimated benefit payments, 2014	1.9
Estimated benefit payments, 2015	1.9
Estimated benefit payments, 2016	2.0
Estimated benefit payments, 2017	2.2
Estimated benefit payments, thereafter	$ 11.5

Schedule of Other Income (Detail) - USD ($) $ in Thousands	12 Months Ended
Schedule of Other Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Income
Interest income	$ 1,525	$ 1,861	$ 1,979
Gain on asset dispositions, net	8,396	3,328	5,135
Escrow settlement (See Note 16)	4,790
Intangible asset impairment loss (See Note 10)	(4,272)
Other, net	552	192	(1,077)
Total	$ 10,991	$ 5,381	$ 6,037

Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leases Disclosure [Line Items]
Rent expense	$ 12.5	$ 12.2	$ 12.8
Minimum rent commitments in 2013	10.9
Minimum rent commitments in 2014	8.3
Minimum rent commitments in 2015	4.9
Minimum rent commitments in 2016	3.1
Minimum rent commitments in 2017	1.6
Minimum rent commitments, thereafter	$ 3.5

Short-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Short-term Debt [Line Items]
Short-term borrowings with banks, which excludes the current portion of long-term debt	$ 0.2	$ 0.2
Average month-end balance	0.9
Maximum month-end balance	$ 2.2
Weighted average interest rate	7.00%	12.00%

Derivative Financial Instrument - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2012 USD ($)
Derivative [Line Items]
Notional amount of open forward contracts	$ 30.9
Unrealized loss on contract	$ 0.8

Balance Sheet Location And Fair Value Of Assets And Liabilities Associated With Derivative Financial Instruments (Detail) - Foreign Exchange Contract - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Prepaid expenses and other current assets	$ 801
Other current liabilities		$ 50

Income Statement Location And Impact Of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivatives Not Designated As Hedging Instruments \| Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Currency exchange losses, net	$ (1,139)	$ 1,282

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References + Details

Acquisitions - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2012 USD ($) Installment	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Oct. 13, 2010 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 179,900
Transaction and integration costs			$ 6,500
Transaction and integration costs, after tax			4,000
Sales	$ 1,179,895	$ 1,178,608	982,668
Net income	91,761	70,045	39,059
Proceeds from escrow settlement	$ 4,790
General Monitors, Inc.
Business Acquisition [Line Items]
Total acquisition price of General Monitors, Inc.				278,200
Escrow deposit, amount				38,000
Weighted-average amortization period of identifiable intangible assets acquired, in years	16 years
Estimated future amortization expense of identifiable intangible assets, in year one	$ 3,300
Estimated future amortization expense of identifiable intangible assets, in year two	3,300
Estimated future amortization expense of identifiable intangible assets, in year three	3,300
Estimated future amortization expense of identifiable intangible assets, in year four	3,300
Estimated future amortization expense of identifiable intangible assets, in year five	3,300
Step up to fair value of acquired inventory	4,800
Sales	99,500	86,200	16,300
Net income	24,700	16,100	200
One-time increase in cost of sales		2,300	2,500
One-time increase in cost of sales, after tax		$ 1,500	$ 1,500
General Monitors, Inc. \| North American Segment
Business Acquisition [Line Items]
Goodwill	136,700
General Monitors, Inc. \| European Segment
Business Acquisition [Line Items]
Goodwill	$ 43,200
General Monitors, Inc. \| 4.00% Series A Senior Notes
Business Acquisition [Line Items]
Issuance of Senior Notes				$ 100,000
Senior Notes, interest rate				4.00%
Senior Notes, maturity date	Oct. 13, 2021
Senior Notes, number of annual installments \| Installment	5
Senior Notes, annual installments payable	$ 20,000

Fair Vale of Asset Acquired and Liabilities Assumed (Detail) $ in Millions	Oct. 13, 2010 USD ($)
Business Acquisition [Line Items]
Current assets (including cash of $18.6 million)	$ 46.8
Property	14.0
Goodwill	179.9
Other noncurrent assets	3.5
Total assets acquired	288.2
Total liabilities assumed	10.0
Net assets acquired	278.2
Trade Names
Business Acquisition [Line Items]
Intangible assets	6.0
Technology Equipment
Business Acquisition [Line Items]
Intangible assets	11.0
Customer-Related Intangibles
Business Acquisition [Line Items]
Intangible assets	$ 27.0

Fair Vale of Asset Acquired and Liabilities Assumed (Parenthetical) (Detail) $ in Millions	Oct. 13, 2010 USD ($)
Business Acquisition [Line Items]
Cash attributable to current assets	$ 18.6

Pro Forma Financial Information (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Net sales	$ 1,173	$ 1,032
Net income	$ 71	$ 50
Basic earnings per share	$ 1.95	$ 1.39
Diluted earnings per share	$ 1.92	$ 1.37

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References + Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References + Details

Fair Value of Financial Instruments - Additional Information (Detail) $ in Millions	Dec. 31, 2012 USD ($)
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]
Carrying amount of fixed rate long-term debt	$ 160.0
Fair value of long-term debt	$ 172.0

Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended			48 Months Ended
	Dec. 31, 2012 USD ($) LegalMatter Vendor	Dec. 31, 2011 USD ($) LegalMatter	Dec. 31, 2010 USD ($) LegalMatter	Dec. 31, 2012 USD ($) LegalMatter	Jan. 01, 2010 USD ($) LegalMatter
Loss Contingencies [Line Items]
Number of lawsuits \| LegalMatter	2,609	2,321	1,900	2,609	2,480
Number of insurance carriers \| Vendor	20
Insurance receivables	$ 130.0	$ 112.1	$ 89.0	$ 130.0	$ 91.7
Uninsured Cumulative Trauma
Loss Contingencies [Line Items]
Product Liability Expense	2.1	1.1	0.2
Cumulative Trauma
Loss Contingencies [Line Items]
Product Liability Expense				99.7
Single Incident
Loss Contingencies [Line Items]
Reserves for product liability claims	4.4	4.7		$ 4.4
Product Liability Expense	$ 0.7	$ 1.5	$ 0.2

Summary of Cumulative Trauma Product Liability Claims Activity (Detail) - LegalMatter	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Contingencies [Abstract]
Open claims, January 1	2,321	1,900	2,480
New claims	750	479	260
Settled and dismissed claims	(462)	(58)	(840)
Open claims, December 31	2,609	2,321	1,900

Summary of Insurance Receivable Balances and Activity Related to Cumulative Trauma Product Liability Losses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Contingencies [Abstract]
Balance January 1	$ 112.1	$ 89.0	$ 91.7
Additions	29.7	35.6	30.9
Collections and settlements	(11.8)	(12.5)	(33.6)
Balance December 31	$ 130.0	$ 112.1	$ 89.0

Schedule of Assets Held for Sale (Detail) $ in Millions	Dec. 31, 2012 USD ($)
Assets Held For Sale [Abstract]
Inventory	$ 2.0
Property, net of depreciation	0.3
Total assets	$ 2.3

Assets Held for Sale - Additional Information (Detail) $ in Millions	Dec. 31, 2012 USD ($)
Other Current Assets
Long Lived Assets Held-for-sale [Line Items]
Investment held for sale	$ 3.5

- Definition

Equity securities categorized neither as held-to-maturity nor trading which are intended be sold within one year from the balance sheet date or the normal operating cycle, whichever is longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 4, 5
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 17
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Data [Line Items]
Net sales	$ 294,114	$ 286,567	$ 294,738	$ 293,485	$ 303,754	$ 298,241	$ 294,733	$ 276,499	$ 1,168,904	$ 1,173,227	$ 976,631
Gross profit	130,361	122,254	123,126	126,991	119,942	120,888	119,009	110,397	502,732	470,236
Net income attributable to Mine Safety Appliances Company	$ 19,487	$ 19,233	$ 27,995	$ 23,922	$ 16,979	$ 19,972	$ 19,592	$ 13,309	$ 90,637	$ 69,852	$ 38,104
Basic	$ 0.53	$ 0.52	$ 0.76	$ 0.65	$ 0.46	$ 0.54	$ 0.53	$ 0.36	$ 2.45	$ 1.91	$ 1.06
Diluted	$ 0.52	$ 0.51	$ 0.75	$ 0.64	$ 0.46	$ 0.54	$ 0.53	$ 0.36	$ 2.42	$ 1.87	$ 1.05

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
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-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

Schedule of Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Allowance for Doubtful Accounts

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at beginning of year

$ 7,043

$ 9,391

$ 6,866

Charged to costs and expenses

1,289

1,148

3,294

Deductions from reserves, net

^[1],[2]

930

3,496

769

Balance at end of year

7,402

7,043

9,391

Income Tax Valuation Allowance

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at beginning of year

2,777

4,323

3,174

Charged to costs and expenses

^[3]

1,184

1,149

Deductions from reserves, net

^[3]

1,546

Balance at end of year

$ 3,961

$ 2,777

$ 4,323

[1]	Activity for 2012, 2011 and 2010 includes currency translation gains (losses) of $428, $(387) and $323, respectively.
[2]	Bad debts written off, net of recoveries.
[3]	Activity for 2012, 2011 and 2010 includes currency translation gains (losses) of $97, $(123) and $87, respectively.

Schedule of Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Currency translation gains (losses)	$ 428	$ (387)	$ 323
Income Tax Valuation Allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Currency translation gains (losses)	$ 97	$ (123)	$ 87