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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2012	Apr. 18, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Entity Registrant Name	MINE SAFETY APPLIANCES CO
Entity Central Index Key	0000066570
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		36,899,541

Condensed Consolidated Statement Of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statement Of Income [Abstract]
Net sales	$ 293,485	$ 276,499
Other income, net	5	796
Total revenues	293,490	277,295
Costs and expenses
Cost of products sold	166,494	166,102
Selling, general and administrative	77,063	73,045
Research and development	9,292	10,543
Restructuring and other charges		3,087
Interest expense	3,149	3,437
Currency exchange losses	2,420	666
Total costs and expenses	258,418	256,880
Income before income taxes	35,072	20,415
Provision for income taxes	10,750	6,919
Net income	24,322	13,496
Net income attributable to noncontrolling interests	(400)	(187)
Net income attributable to Mine Safety Appliances Company	$ 23,922	$ 13,309
Earnings per share attributable to Mine Safety Appliances Company common shareholders
Basic	$ 0.65	$ 0.36
Diluted	0.64	0.36
Dividends per common share	$ 0.26	$ 0.25

Condensed Consolidated Statement Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statement Of Comprehensive Income [Abstract]
Net income	$ 24,322	$ 13,496
Foreign currency translation gain	9,364	8,591
Comprehensive income	33,686	22,087
Comprehensive (income) loss attributable to noncontrolling interests	(766)	1
Comprehensive income attributable to Mine Safety Appliances Company	$ 32,920	$ 22,088

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 8, 9, 10, 11, 12, 13, 14
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A5
-Appendix A

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-URI http://asc.fasb.org/extlink&oid=6518256

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
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+ 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, if any. 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

Change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported, net of tax. If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

+ References

+ 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
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
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-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 3: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 56,648	$ 59,938
Trade receivables, less allowance for doubtful accounts of $7,921 and $7,043	210,337	192,627
Inventories	150,652	141,475
Deferred tax assets	22,361	21,744
Income taxes receivable	13,257	13,769
Prepaid expenses and other current assets	23,786	29,296
Total current assets	477,041	458,849
Property, less accumulated depreciation of $308,751 and $311,272	148,336	145,763
Prepaid pension cost	59,020	58,075
Deferred tax assets	11,728	12,065
Goodwill	260,927	259,084
Other noncurrent assets	180,599	181,216
Total assets	1,137,651	1,115,052
Current liabilities
Notes payable and current portion of long-term debt	9,275	8,263
Accounts payable	61,368	50,208
Employees' compensation	32,527	38,400
Insurance and product liability	18,741	15,738
Taxes on income	11,070	3,051
Other current liabilities	53,718	56,110
Total current liabilities	186,699	171,770
Long-term debt	312,029	334,046
Pensions and other employee benefits	126,930	124,310
Deferred tax liabilities	30,506	30,458
Other noncurrent liabilities	14,807	15,057
Total liabilities	670,971	675,641
Commitments and Contingencies
Mine Safety Appliances Company shareholders' equity:
Preferred stock, 4 1/2% cumulative, authorized 100,000 shares of $50 par value, issued 71,373 and 71,373 shares, callable at $52.50 per share	3,569	3,569
Second cumulative preferred voting stock, authorized 1,000,000 shares of $10 par value, none issued
Common stock, no par value, issued 62,081,391 and 62,081,391 shares, outstanding 36,890,181 and 36,692,590 shares	101,347	97,276
Stock compensation trust, 900,122 and 1,162,784 shares	(4,699)	(6,070)
Treasury shares, at cost, preferred-52,878 and 52,878 shares, common-24,291,088 and 24,226,017 shares :	(268,540)	(266,231)
Accumulated other comprehensive loss	(94,186)	(103,184)
Retained earnings	722,678	708,306
Total Mine Safety Appliances Company shareholders' equity	460,169	433,666
Noncontrolling interests	6,511	5,745
Total shareholders' equity	466,680	439,411
Total liabilities and shareholders' equity	$ 1,137,651	$ 1,115,052

Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Trade receivables, allowance for doubtful accounts	$ 7,921	$ 7,043
Property, accumulated depreciation	$ 308,751	$ 311,272
Common stock, par value	$ 0	$ 0
Common stock, shares issued	62,081,391	62,081,391
Common stock, shares outstanding	36,890,181	36,692,590
Stock compensation trust, shares	900,122	1,162,784
Treasury shares, at cost, preferred	52,878	52,878
Treasury shares, at cost, common	24,291,088	24,226,017
Preferred Stock, 4 1/2% Cumulative [Member]
Percentage of cumulative preferred stock	4.50%	4.50%
Preferred stock, shares authorized	100,000	100,000
Preferred stock, par value	$ 50	$ 50
Preferred stock, shares issued	71,373	71,373
Preferred stock, callable per share	$ 52.50	$ 52.50
Second Cumulative Preferred Voting Stock [Member]
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value	$ 10	$ 10
Preferred stock, shares issued	0	0

Condensed Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Activities
Net income	$ 24,322	$ 13,496
Depreciation and amortization	7,986	8,425
Pensions	675	(1,262)
Net loss (gain) from investing activities-disposal of assets	39	(25)
Stock-based compensation	2,918	2,686
Deferred income tax provision (benefit)	531	(2,101)
Other noncurrent assets and liabilities	(2,307)	(7,087)
Currency exchange losses	2,420	666
Excess tax (benefit) provision related to stock plans	(1,136)	208
Other, net	(1,146)	78
Operating cash flow before changes in working capital	34,302	15,084
Trade receivables	(14,719)	(8,705)
Inventories	(5,492)	(2,778)
Accounts payable and accrued liabilities	12,805	(241)
Income taxes receivable, prepaid expenses and other current assets	6,536	7,283
Increase in working capital	(870)	(4,441)
Cash flow from operating activities	33,432	10,643
Investing Activities
Capital expenditures	(8,044)	(7,387)
Other investing	95	33
Cash flow from investing activities	(7,949)	(7,354)
Financing Activities
Proceeds from (payments on) short-term debt, net	984	(72)
Proceeds from long-term debt	35,500	12,500
Payments on long-term debt	(57,500)
Cash dividends paid	(9,550)	(9,142)
Company stock purchases	(2,308)	(518)
Exercise of stock options	1,389	66
Excess tax benefit (provision) related to stock plans	1,136	(208)
Cash flow from financing activities	(30,349)	2,626
Effect of exchange rate changes on cash	1,576	1,312
(Decrease) increase in cash and cash equivalents	(3,290)	7,227
Beginning cash and cash equivalents	59,938	59,760
Ending cash and cash equivalents	$ 56,648	$ 66,987

Basis Of Presentation	3 Months Ended
Basis Of Presentation	Mar. 31, 2012
Basis Of Presentation [Abstract]
Basis Of Presentation	(1) Basis of Presentation We have prepared the condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information and with the rules and regulations for reporting on Form 10-Q. Accordingly, they do not include certain information and disclosures required for comprehensive financial statements. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. The other information in these financial statements is unaudited; however, we believe that all adjustments, consisting of only normal recurring adjustments, necessary for a fair presentation of these interim periods have been included. The results for interim periods are not necessarily indicative of the results to be expected for the full year. The condensed consolidated financial statements include the accounts of the company and all subsidiaries. Intercompany accounts and transactions have been eliminated.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-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 2: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Restructuring And Other Charges	3 Months Ended
Restructuring And Other Charges	Mar. 31, 2012
Restructuring And Other Charges [Abstract]
Restructuring And Other Charges	(2) Restructuring and Other Charges We did not incur any restructuring charges during the three months ended March 31, 2012. During the three months ended March 31, 2011, we recorded charges of $3.1 million ($2.0 million after tax). European segment charges of $1.7 million related primarily to staff reductions in Germany and the transfer of certain production activities to China and the United States. North American segment charges of $0.5 million included costs associated with the relocation of certain administrative and production activities. International segment charges of $0.9 million were related to severance costs associated with the relocation of our Wuxi, China operations to Suzhou, China.

- 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

Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2012

Accumulated Other Comprehensive Loss [Abstract]

Accumulated Other Comprehensive Loss

(3) Accumulated Other Comprehensive Loss

Components of accumulated other comprehensive loss are as follows:


(In thousands)	March 31, 2012			December 31, 2011
Cumulative translation adjustments	$	9,827		$	829
Pension and post-retirement plan adjustments		(104,013	)		(104,013	)

Accumulated other comprehensive loss		(94,186	)		(103,184	)

Earnings Per Share

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share

(4) 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.


	Three Months Ended March 31,
(In thousands, except per share amounts)	2012			2011
Net income attributable to Mine Safety Appliances Company	$	23,922		$	13,309
Preferred stock dividends		(10	)		(10	)

Income available to common equity		23,912			13,299
Dividends and undistributed earnings allocated to participating securities		(261	)		(142	)

Income available to common shareholders		23,651			13,157

Basic earnings per common share	$	0.65		$	0.36

Diluted earnings per common share	$	0.64		$	0.36

Basic shares outstanding		36,369			36,165
Stock options and other stock compensation		509			630

Diluted shares outstanding		36,878			36,795

Antidilutive stock options		924			873

Segment Information

3 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Segment Information

(5) Segment Information

We are organized into 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
Three Months Ended March 31, 2012
Sales to external customers	$	137,484	$	72,466	$	83,535	$	—		$	293,485
Intercompany sales		26,618		24,909		4,546		(56,073	)		—
Net income (loss) attributable to Mine Safety Appliances Company		16,257		5,621		8,265		(6,221	)		23,922
Three Months Ended March 31, 2011
Sales to external customers	$	130,916	$	64,839	$	80,744	$	—		$	276,499
Intercompany sales		24,543		28,387		3,658		(56,588	)		—
Net income (loss) attributable to Mine Safety Appliances Company		9,823		1,587		7,377		(5,478	)		13,309

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

- 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

Reference 1: 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.

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-Publisher FASB
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-Name Accounting Standards Codification
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-Publisher FASB
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

+ Details

Pensions And Other Postretirement Benefits

3 Months Ended

Mar. 31, 2012

Pensions And Other Postretirement Benefits [Abstract]

Pensions And Other Postretirement Benefits

(6) Pensions and Other Postretirement Benefits

Components of net periodic benefit cost (credit) consisted of the following:


	Pension Benefits						Other Benefits
(In thousands)	2012			2011			2012			2011
Three months ended March 31
Service cost	$	2,436		$	2,164		$	174		$	218
Interest cost		4,789			4,875			316			435
Expected return on plan assets		(8,101	)		(8,526	)		—			—
Amortization of transition amounts		1			1			—			—
Amortization of prior service cost		76			26			(114	)		(114	)
Recognized net actuarial losses		1,474			198			132			213

Net periodic benefit cost (credit)		675			(1,262	)		508			752

We made contributions of $1.0 million to our pension plans during the three months ended March 31, 2012. We expect to make total contributions of approximately $4.1 million to our pension plans in 2012.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: 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.

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-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
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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.

Reference 5: 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 6: 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 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 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 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-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.

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-Name FASB Staff Position (FSP)
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Reference 13: 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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

+ Details

Goodwill And Intangible Assets

3 Months Ended

Mar. 31, 2012

Goodwill And Intangible Assets [Abstract]

Goodwill And Intangible Assets

(7) Goodwill and Intangible Assets

Changes in goodwill during the three months ended March 31, 2012 were as follows:


(In thousands)	Goodwill
Net balance at January 1	$	259,084
Currency translation		1,843

Net balance at March 31		260,927

At March 31, 2012, goodwill of $198.3 million, $59.0 million, and $3.6 million related to the North American, European, and International reporting units, respectively.

Changes in intangible assets, net of accumulated amortization (which are reported in other noncurrent assets) during the three months ended March 31, 2012 were as follows:


(In thousands)	Intangibles
Net balance at January 1	$	47,119
Amortization expense		(1,110	)
Currency translation		174

Net balance at March 31		46,183

- 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

Inventories

3 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Inventories

(8) Inventories


(In thousands)	March 31, 2012		December 31, 2011
Finished products	$	62,504	$	65,687
Work in process		15,442		17,000
Raw materials and supplies		72,706		58,788

Total inventories		150,652		141,475

Stock Plans

3 Months Ended

Mar. 31, 2012

Stock Plans [Abstract]

Stock Plans

(9) Stock Plans

The 2008 Management Equity Incentive Plan provides for various forms of stock-based compensation for eligible 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. 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 grantee's employment with the company terminates for any reason other than death or disability. Restricted stock and performance stock units are 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 or total shareholder return over a three year performance period relative to a pre-determined peer group of companies. We issue Stock Compensation Trust shares or new shares for stock option exercises, restricted stock grants, and performance stock unit grants.

Stock compensation expense was as follows:


	Three Months Ended March 31,
(In thousands)	2012		2011
Stock compensation expense	$	2,918	$	2,686
Income tax benefit		1,048		870

Stock compensation expense, net of income tax benefit		1,870		1,816

A summary of stock option activity for the three months ended March 31, 2012 follows:


	Shares			Weighted Average Exercise Price
Outstanding at January 1		1,818,640		$	30.94
Granted		175,069			36.69
Exercised		(96,187	)		14.44
Expired		(2,494	)		44.11

Outstanding at March 31		1,895,028			32.29

Exercisable at March 31		1,190,902			33.70

A summary of restricted stock activity for the three months ended March 31, 2012 follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1		512,254		$	25.66
Granted		102,628			36.70
Vested		(169,734	)		18.11
Forfeited		(3,432	)		24.07

Unvested at March 31		441,716			31.13

A summary of performance stock unit activity for the three months ended March 31, 2012 follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1		125,443		$	25.27
Granted		50,428			36.69
Performance adjustments		(1,466	)		17.83
Vested		(46,206	)		17.83

Unvested at March 31		128,199			32.53

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References + Details

Derivative Financial Instruments

3 Months Ended

Mar. 31, 2012

Derivative Financial Instruments [Abstract]

Derivative Financial Instruments

(10) 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 at fair value and report the related gains or losses in currency exchange gains or losses. At March 31, 2012, the notional amount of open forward contracts and the unrealized gain on these contracts was immaterial.

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


(In thousands)	March 31, 2012		December 31, 2011
Derivatives not designated as hedging instruments
Foreign exchange contracts:
Prepaid expenses and other current assets	$	3	$	—
Other current liabilities		—		50

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

Loss (Gain)
Recognized in Income

Three Months Ended
March 31,

(In thousands)

Income Statement
Location

2012

2011

Derivatives not designated as hedging instruments

Foreign exchange contracts

Currency exchange
losses

(254

)

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-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 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2012
Income Taxes [Abstract]
Income Taxes	(11) Income Taxes At March 31, 2012, we had a gross liability for unrecognized tax benefits of $12.8 million. We have recognized tax benefits associated with these liabilities of $11.4 million at March 31, 2012. These balances are unchanged since December 31, 2011. We do not expect that the total amount of the unrecognized tax benefits will significantly increase or decrease within twelve months of the reporting date. 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 $1.0 million at March 31, 2012.

- 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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-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.

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-Name Statement of Financial Accounting Standard (FAS)
-Number 109
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Fair Value Measurements

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Fair Value Measurements

(12) 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 derivative financial instruments described in Note 10. 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

Tabular disclosure of the fair value measurement of assets and liabilities which includes [financial] instruments measured at fair value that are classified in stockholders' equity. Such assets and liabilities may be measured on a recurring or nonrecurring basis. The disclosures which may be required or desired include: (1) for assets and liabilities measured on a recurring basis, disclosure may include: (a) the fair value measurements at the reporting date; (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3); (c) for fair value measurements using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (i) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (ii) purchases, sales, issuances, and settlements (net); (iii) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs); (d) the amount of the total gains or losses for the period in subparagraph (c) (i) above included in earnings (or changes in net assets) that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date and a description of where those unrealized gains or losses are reported in the statement of income (or activities); (e) the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period and (2) for assets and liabilities that are measured at fair value on a nonrecurring basis (for example, impaired assets) disclosure may include, in addition to (a) above: (a) the reasons for the fair value measurements recorded; (b) the same as (b) above; (c) for fair value measurements using significant unobservable inputs (Level 3), a description of the inputs and the information used to develop the inputs; and (d) the valuation technique(s) used to measure fair value and a discussion of changes, if any, in the valuation technique(s) used to measure similar assets and/or liabilities in prior periods. Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-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 157
-Paragraph 33
-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 157
-Paragraph 6
-Footnote 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 5: 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=6925170&loc=d3e19207-110258

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Fair Value Of Financial Instruments	3 Months Ended
Fair Value Of Financial Instruments	Mar. 31, 2012
Fair Value Of Financial Instruments [Abstract]
Fair Value Of Financial Instruments	(13) 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 March 31, 2012, the reported carrying amount of our fixed rate long-term debt was $168.0 million and the fair value was $176.9 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 March 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 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 2: 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 3: 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 4: 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 5: 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.

Reference 6: 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 7: 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 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-Name Accounting Standards Codification
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-Paragraph 21
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Name Accounting Standards Codification
-Topic 825
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13504-108611

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Assets Held For Sale

3 Months Ended

Mar. 31, 2012

Assets Held For Sale [Abstract]

Assets Held For Sale

(14) Assets Held for Sale

Certain assets related to our North American ballistic helmet business and German detector tube manufacturing are classified as held for sale at March 31, 2012. These assets are reported in the following balance sheet lines.


(In millions)	March 31, 2012
Inventory	$	7.1
Property, net of depreciation		0.9
Goodwill		2.0

Total assets		10.0

The potential impact of the sale of these assets is not expected to be material to net income or earnings per share. The operating results of the North American ballistic helmet business are not material to net income or earnings per share during any period presented and are not expected to be material to future periods.

Contingencies

3 Months Ended

Mar. 31, 2012

Contingencies [Abstract]

Contingencies

(15) 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 was $4.7 million at both March 31, 2012 and December 31, 2011. Single incident product liability expense during the three months ended March 31, 2012 and 2011 was $0.3 million and $0.4 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 2,418 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:


	Three Months Ended March 31, 2012			Year Ended December 31, 2011
Open claims, beginning of period		2,321			1,900
New claims		134			479
Settled and dismissed claims		(37	)		(58	)

Open claims, end of period		2,418			2,321

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 March 31, 2012 totaled $114.1 million, of which $2.0 million is reported in other current assets and $112.1 million in other non-current assets. Our insurance receivables at December 31, 2011 totaled $112.1 million, 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)	Three Months Ended March 31, 2012			Year Ended December 31, 2011
Balance beginning of period	$	112.1		$	89.0
Additions		7.4			35.6
Collections and settlements		(5.4	)		(12.5	)

Balance end of period		114.1			112.1

Additions to insurance receivables in the above table represent insured cumulative trauma product liability losses and related defense costs. There were no uninsured cumulative trauma product liability losses during the three month periods ended March 31, 2012 and 2011.

Our aggregate cumulative trauma product liability losses and administrative and defense costs for the three years ended December 31, 2011, totaled approximately $102.7 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 during 2011 and 2010 demonstrates that we had 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. The case is currently in discovery.

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. The case is currently in discovery.

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. In January 2011, the Superior Court of the State of Delaware granted a stay of the lawsuit, pending resolution of the two above-referenced actions in the United States District Court for the Western District of Pennsylvania and the Court of Common Pleas of Allegheny County, Pennsylvania. Although those lawsuits have not yet reached conclusion, in March 2012 the Court lifted the stay. The case will proceed to discovery.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: 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 2: 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.

Reference 3: 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 4: 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 5: 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 6: 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 7: 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

+ Details

Recently Adopted And Recently Issued Accounting Standards	3 Months Ended
	Mar. 31, 2012
Recently Adopted And Recently Issued Accounting Standards [Abstract]
Recently Adopted And Recently Issued Accounting Standards	(16) 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. The ASU eliminates the option of presenting other comprehensive income in the statement of shareholders' equity. In December 2011, the FASB issued ASU 2011-12, which indefinitely deferred the ASU 2011-5 requirement related to the presentation of reclassification adjustments from accumulated other comprehensive income. The adoption of this ASU 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.

Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2012

Accumulated Other Comprehensive Loss [Abstract]

Components Of Accumulated Other Comprehensive Loss


(In thousands)	March 31, 2012			December 31, 2011
Cumulative translation adjustments	$	9,827		$	829
Pension and post-retirement plan adjustments		(104,013	)		(104,013	)

Accumulated other comprehensive loss		(94,186	)		(103,184	)

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share


	Three Months Ended March 31,
(In thousands, except per share amounts)	2012			2011
Net income attributable to Mine Safety Appliances Company	$	23,922		$	13,309
Preferred stock dividends		(10	)		(10	)

Income available to common equity		23,912			13,299
Dividends and undistributed earnings allocated to participating securities		(261	)		(142	)

Income available to common shareholders		23,651			13,157

Basic earnings per common share	$	0.65		$	0.36

Diluted earnings per common share	$	0.64		$	0.36

Basic shares outstanding		36,369			36,165
Stock options and other stock compensation		509			630

Diluted shares outstanding		36,878			36,795

Antidilutive stock options		924			873

Segment Information (Tables)

3 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Schedule Of Reportable Segment Information


(In thousands)	North America		Europe		International		Reconciling Items			Consolidated Totals
Three Months Ended March 31, 2012
Sales to external customers	$	137,484	$	72,466	$	83,535	$	—		$	293,485
Intercompany sales		26,618		24,909		4,546		(56,073	)		—
Net income (loss) attributable to Mine Safety Appliances Company		16,257		5,621		8,265		(6,221	)		23,922
Three Months Ended March 31, 2011
Sales to external customers	$	130,916	$	64,839	$	80,744	$	—		$	276,499
Intercompany sales		24,543		28,387		3,658		(56,588	)		—
Net income (loss) attributable to Mine Safety Appliances Company		9,823		1,587		7,377		(5,478	)		13,309

- 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

Pensions And Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2012

Pensions And Other Postretirement Benefits [Abstract]

Schedule Of Components Of Net Periodic Benefit Cost (Credit)


	Pension Benefits						Other Benefits
(In thousands)	2012			2011			2012			2011
Three months ended March 31
Service cost	$	2,436		$	2,164		$	174		$	218
Interest cost		4,789			4,875			316			435
Expected return on plan assets		(8,101	)		(8,526	)		—			—
Amortization of transition amounts		1			1			—			—
Amortization of prior service cost		76			26			(114	)		(114	)
Recognized net actuarial losses		1,474			198			132			213

Net periodic benefit cost (credit)		675			(1,262	)		508			752

Goodwill And Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2012

Goodwill And Intangible Assets [Abstract]

Schedule Of Changes In Goodwill


(In thousands)	Goodwill
Net balance at January 1	$	259,084
Currency translation		1,843

Net balance at March 31		260,927

Schedule Of Changes In Intangible Assets, Net Of Accumulated Amortization


(In thousands)	Intangibles
Net balance at January 1	$	47,119
Amortization expense		(1,110	)
Currency translation		174

Net balance at March 31		46,183

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Inventories (Tables)

3 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Schedule Of Inventories


(In thousands)	March 31, 2012		December 31, 2011
Finished products	$	62,504	$	65,687
Work in process		15,442		17,000
Raw materials and supplies		72,706		58,788

Total inventories		150,652		141,475

Stock Plans (Tables)

3 Months Ended

Mar. 31, 2012

Stock Plans [Abstract]

Schedule Of Stock Compensation Expense


	Three Months Ended March 31,
(In thousands)	2012		2011
Stock compensation expense	$	2,918	$	2,686
Income tax benefit		1,048		870

Stock compensation expense, net of income tax benefit		1,870		1,816

Summary Of Stock Option Activity


	Shares			Weighted Average Exercise Price
Outstanding at January 1		1,818,640		$	30.94
Granted		175,069			36.69
Exercised		(96,187	)		14.44
Expired		(2,494	)		44.11

Outstanding at March 31		1,895,028			32.29

Exercisable at March 31		1,190,902			33.70

Summary Of Restricted Stock Activity


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1		512,254		$	25.66
Granted		102,628			36.70
Vested		(169,734	)		18.11
Forfeited		(3,432	)		24.07

Unvested at March 31		441,716			31.13

Summary Of Performance Stock Unit Activity


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1		125,443		$	25.27
Granted		50,428			36.69
Performance adjustments		(1,466	)		17.83
Vested		(46,206	)		17.83

Unvested at March 31		128,199			32.53

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2012

Derivative Financial Instruments [Abstract]

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


(In thousands)	March 31, 2012		December 31, 2011
Derivatives not designated as hedging instruments
Foreign exchange contracts:
Prepaid expenses and other current assets	$	3	$	—
Other current liabilities		—		50

Income Statement Location And Impact Of Derivative Financial Instruments

Loss (Gain)
Recognized in Income

Three Months Ended
March 31,

(In thousands)

Income Statement
Location

2012

2011

Derivatives not designated as hedging instruments

Foreign exchange contracts

Currency exchange
losses

(254

)

- 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

Assets Held For Sale (Tables)

3 Months Ended

Mar. 31, 2012

Assets Held For Sale [Abstract]

Schedule Of Assets Held For Sale


(In millions)	March 31, 2012
Inventory	$	7.1
Property, net of depreciation		0.9
Goodwill		2.0

Total assets		10.0

Contingencies (Tables)

3 Months Ended

Mar. 31, 2012

Contingencies [Abstract]

Summary Of Cumulative Trauma Product Liability Claims Activity


	Three Months Ended March 31, 2012			Year Ended December 31, 2011
Open claims, beginning of period		2,321			1,900
New claims		134			479
Settled and dismissed claims		(37	)		(58	)

Open claims, end of period		2,418			2,321

Summary Of Insurance Receivable Balances And Activity Related To Cumulative Trauma Product Liability Losses


(In millions)	Three Months Ended March 31, 2012			Year Ended December 31, 2011
Balance beginning of period	$	112.1		$	89.0
Additions		7.4			35.6
Collections and settlements		(5.4	)		(12.5	)

Balance end of period		114.1			112.1

- 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

Restructuring And Other Charges (Details) $ in Thousands	3 Months Ended
Restructuring And Other Charges (Details) $ in Thousands	Mar. 31, 2011 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 3,087
Restructuring and other charges, net of tax	2,000
European Segment [Member]
Restructuring Cost and Reserve [Line Items]
Staff reductions charges	1,700
North American Segment [Member]
Restructuring Cost and Reserve [Line Items]
Costs associated with the relocation of certain administrative and production activities	500
International Segment [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 900

- 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 SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

Reference 2: 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 3: 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 4: 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.

Reference 5: 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 6: 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 7: 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 8: 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 9: 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 10: 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=6962843&loc=d3e1928-114920

+ Details

Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Loss [Abstract]
Cumulative translation adjustments	$ 9,827	$ 829
Pension and post-retirement plan adjustments	(104,013)	(104,013)
Accumulated other comprehensive loss	$ (94,186)	$ (103,184)

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 26
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph i
-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 158
-Paragraph 7
-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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 18, 19, 22, 23, 24, 25, 26
-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 133
-Paragraph 45
-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 52
-Paragraph 12, 13
-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 52
-Paragraph 31
-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 Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

+ Details

Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Net income attributable to Mine Safety Appliances Company	$ 23,922	$ 13,309
Preferred stock dividends	(10)	(10)
Income available to common equity	23,912	13,299
Dividends and undistributed earnings allocated to participating securities	(261)	(142)
Income available to common shareholders	$ 23,651	$ 13,157
Basic earnings per common share	$ 0.65	$ 0.36
Diluted earnings per common share	$ 0.64	$ 0.36
Basic shares outstanding	36,369	36,165
Stock options and other stock compensation	509	630
Diluted shares outstanding	36,878	36,795
Antidilutive stock options	924	873

Segment Information (Schedule Of Reportable Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Sales to external customers	$ 293,485	$ 276,499
Net income (loss) attributable to Mine Safety Appliances Company	23,922	13,309
North America [Member]
Segment Reporting Information [Line Items]
Sales to external customers	137,484	130,916
Intercompany sales	26,618	24,543
Net income (loss) attributable to Mine Safety Appliances Company	16,257	9,823
Europe [Member]
Segment Reporting Information [Line Items]
Sales to external customers	72,466	64,839
Intercompany sales	24,909	28,387
Net income (loss) attributable to Mine Safety Appliances Company	5,621	1,587
International [Member]
Segment Reporting Information [Line Items]
Sales to external customers	83,535	80,744
Intercompany sales	4,546	3,658
Net income (loss) attributable to Mine Safety Appliances Company	8,265	7,377
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Intercompany sales	(56,073)	(56,588)
Net income (loss) attributable to Mine Safety Appliances Company	$ (6,221)	$ (5,478)

- 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 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 2: 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 3: 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 4: 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 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 19

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

Reference 7: 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 8: 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 9: 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 10: 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 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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 13: 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=6920043&loc=d3e565-108580

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 15: 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 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

+ Details

Pensions And Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Pension plans contributions	$ 1,000
Total pension plans contributions for the period	4,100
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,436	$ 2,164
Interest cost	4,789	4,875
Expected return on plan assets	(8,101)	(8,526)
Amortization of transition amounts	1	1
Amortization of prior service cost	76	26
Recognized net actuarial losses	1,474	198
Net periodic benefit cost (credit)	675	(1,262)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	174	218
Interest cost	316	435
Amortization of prior service cost	(114)	(114)
Recognized net actuarial losses	132	213
Net periodic benefit cost (credit)	$ 508	$ 752

Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 260,927	$ 259,084
North American [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	198,300
European [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	59,000
International [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 3,600

- 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 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 2: 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 3: 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 4: 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 5: 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=6905597&loc=d3e13816-109267

Reference 6: 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 7: 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 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 (Schedule Of Changes In Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2012 USD ($)
Goodwill And Intangible Assets [Abstract]
Net balance at January 1	$ 259,084
Currency translation	1,843
Net balance at March 31	$ 260,927

- Definition

+ References

+ Details

Goodwill And Intangible Assets (Schedule Of Changes In Intangible Assets, Net Of Accumulated Amortization) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2012 USD ($)
Goodwill And Intangible Assets [Abstract]
Net balance at January 1	$ 47,119
Amortization expense	(1,110)
Currency translation	174
Net balance at March 31	$ 46,183

Inventories (Schedule Of Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Finished products	$ 62,504	$ 65,687
Work in process	15,442	17,000
Raw materials and supplies	72,706	58,788
Total inventories	$ 150,652	$ 141,475

Stock Plans (Narrative) (Details)	3 Months Ended
Stock Plans (Narrative) (Details)	Mar. 31, 2012
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	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
Performance period relative to a pre-determined peer group	3 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award based on achieving targeted performance conditions	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award based on achieving targeted performance conditions	200.00%

Stock Plans (Schedule Of Stock Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stock Plans [Abstract]
Stock compensation expense	$ 2,918	$ 2,686
Income tax benefit	1,048	870
Stock compensation expense, net of income tax benefit	$ 1,870	$ 1,816

Stock Plans (Summary Of Stock Option Activity) (Details)	3 Months Ended
	Mar. 31, 2012 $ / shares shares
Stock Plans [Abstract]
Outstanding at January 1, Shares \| shares	1,818,640
Granted, Shares \| shares	175,069
Exercised, Shares \| shares	(96,187)
Expired, Shares \| shares	(2,494)
Outstanding at March 31, Shares \| shares	1,895,028
Exercisable at March 31, Shares \| shares	1,190,902
Outstanding at January 1, Weighted Average Exercise Price \| $ / shares	$ 30.94
Granted, Weighted Average Exercise Price \| $ / shares	36.69
Exercised, Weighted Average Exercise Price \| $ / shares	14.44
Expired, Weighted Average Exercise Price \| $ / shares	44.11
Outstanding at March 31, Weighted Average Exercise Price \| $ / shares	32.29
Exercisable at March 31, Weighted Average Exercise Price \| $ / shares	$ 33.70

Stock Plans (Summary Of Restricted Stock Activity) (Details) - Restricted Stock Activity [Member]	3 Months Ended
	Mar. 31, 2012 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at January 1, Shares \| shares	512,254
Granted, Shares \| shares	102,628
Vested, Shares \| shares	(169,734)
Forfeited, Shares \| shares	(3,432)
Unvested at March 31, Shares \| shares	441,716
Unvested at January 1, Weighted Average Grant Date Fair value \| $ / shares	$ 25.66
Granted, Weighted Average Grant Date Fair Value \| $ / shares	36.70
Vested, Weighted Average Grant Date Fair Value \| $ / shares	18.11
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	24.07
Unvested at March 31, Weighted Average Grant Date Fair Value \| $ / shares	$ 31.13

Stock Plans (Summary Of Performance Stock Unit Activity) (Details) - Performance Stock Unit Activity [Member]	3 Months Ended
	Mar. 31, 2012 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at January 1, Shares \| shares	125,443
Granted, Shares \| shares	50,428
Performance adjustments, Shares \| shares	(1,466)
Vested, Shares \| shares	(46,206)
Unvested at March 31, Shares \| shares	128,199
Unvested at January 1, Weighted Average Grant Date Fair value \| $ / shares	$ 25.27
Granted, Weighted Average Grant Date Fair Value \| $ / shares	36.69
Performance adjustments, Weighted Average Grant Date Fair Value \| $ / shares	17.83
Vested, Weighted Average Grant Date Fair Value \| $ / shares	17.83
Unvested at March 31, Weighted Average Grant Date Fair Value \| $ / shares	$ 32.53

Derivative Financial Instruments (Balance Sheet Location And Fair Value Of Assets And Liabilities Associated With Derivative Financial Instruments) (Details) - Foreign Exchange Contracts [Member] - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Prepaid expenses and other current assets	$ 3
Other current liabilities		$ 50

Derivative Financial Instruments (Income Statement Location And Impact Of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivatives Not Designated As Hedging Instruments [Member] \| Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Currency exchange losses	$ 92	$ (254)

- 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

Income Taxes (Details) $ in Millions	Mar. 31, 2012 USD ($)
Income Taxes [Abstract]
Unrecognized tax benefits	$ 12.8
Recognized tax benefits	11.4
Accrued interest and penalties related to uncertain tax positions	$ 1.0

Fair Value Of Financial Instruments (Details) $ in Millions	Mar. 31, 2012 USD ($)
Fair Value Of Financial Instruments [Abstract]
Carrying amount of fixed rate long-term debt	$ 168.0
Fair value of long-term debt	$ 176.9

Assets Held For Sale (Schedule Of Assets Held For Sale) (Details) $ in Millions	Mar. 31, 2012 USD ($)
Assets Held For Sale [Abstract]
Inventory	$ 7.1
Property, net of depreciation	0.9
Goodwill	2.0
Total assets	$ 10.0

Contingencies (Narrative) (Details) $ in Millions	3 Months Ended		36 Months Ended
Contingencies (Narrative) (Details) $ in Millions	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Loss Contingencies [Line Items]
Number of lawsuits	2,418		2,321	1,900
Number of insurance carriers	20
Insurance receivables	$ 114.1		$ 112.1	$ 89.0
Single Incident [Member]
Loss Contingencies [Line Items]
Reserves for product liability claims	4.7		4.7
Product liability expense	0.3	$ 0.4
Cumulative Trauma [Member]
Loss Contingencies [Line Items]
Product liability expense			$ 102.7
Other Current Assets [Member]
Loss Contingencies [Line Items]
Insurance receivables	2.0
Other Non-Current Assets [Member]
Loss Contingencies [Line Items]
Insurance receivables	$ 112.1

Contingencies (Summary Of Cumulative Trauma Product Liability Claims Activity) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Contingencies [Abstract]
Open claims, beginning of period	2,321	1,900
New claims	134	479
Settled and dismissed claims	(37)	(58)
Open claims, end of period	2,418	2,321

Contingencies (Summary Of Insurance Receivable Balances And Activity Related To Cumulative Trauma Product Liability Losses) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Contingencies [Abstract]
Balance beginning of period	$ 112.1	$ 89.0
Additions	7.4	35.6
Collections and settlements	(5.4)	(12.5)
Balance end of period	$ 114.1	$ 112.1