Earnings Per Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Net income attributable to Mine Safety Appliances Company	$ 19,972	$ 9,603	$ 52,873	$ 26,336
Preferred stock dividends	(10)	(10)	(30)	(30)
Income available to common equity	19,962	9,593	52,843	26,306
Dividends and undistributed earnings allocated to participating securities	(217)	(96)	(572)	(258)
Income available to common shareholders	$ 19,745	$ 9,497	$ 52,271	$ 26,048
Basic earnings per common share	$ 0.54	$ 0.27	$ 1.44	$ 0.73
Diluted earnings per common share	$ 0.54	$ 0.26	$ 1.42	$ 0.72
Basic shares outstanding	36,236	35,917	36,206	35,819
Stock options and other stock compensation	563	474	611	547
Diluted shares outstanding	36,799	36,391	36,817	36,366
Antidilutive stock options	896	1,263	896	1,263

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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