Consolidated Statements of Shareholders' Equity and Comprehensive Income (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2008	$ 503,247	$ 448	$ 559,772	$ (873,601)	$ 848,489	$ (31,861)
Beginning balance, shares at Dec. 31, 2008		33,595,303
Exercise of stock options and restricted stock units, shares		308,154
Other Treasury Stock Issuances, Shares		6,467
Repurchases of Common Stock, Shares		(58,800)
Tax benefit resulting from exercise of certain employee stock options	2,895		2,895
Share-based compensation	11,367		11,367
Exercise of stock options and restricted stock units, Value	11,068			21,998	(10,930)
Other treasury stock issuances, Value	304			461	(157)
Repurchases of Common Stock, Value	(5,988)			(5,988)
Net earnings	172,593				172,593
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	5,401					5,401
Other Comprehensive Income Foreign Currency Transaction and Translation Gain Loss Adjustment Net of Tax	15,835					15,835
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(5,584)					(5,584)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	188,245
Ending balance at Dec. 31, 2009	711,138	448	574,034	(857,130)	1,009,995	(16,209)
Ending balance, shares at Dec. 31, 2009		33,851,124
Exercise of stock options and restricted stock units, shares	527,276	527,276
Other Treasury Stock Issuances, Shares	2,549	2,549
Repurchases of Common Stock, Shares	(1,955,634)	(1,955,634)
Tax benefit resulting from exercise of certain employee stock options	10,776		10,776
Share-based compensation	12,385		12,385
Exercise of stock options and restricted stock units, Value	20,455			39,555	(19,100)
Other treasury stock issuances, Value	270			183	87
Repurchases of Common Stock, Value	(239,998)			(239,998)
Net earnings	232,148				232,148
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(6,410)					(6,410)
Other Comprehensive Income Foreign Currency Transaction and Translation Gain Loss Adjustment Net of Tax	31,647					31,647
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(827)					(827)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	256,558
Ending balance at Dec. 31, 2010	771,584	448	597,195	(1,057,390)	1,223,130	8,201
Ending balance, shares at Dec. 31, 2010	32,425,315	32,425,315
Exercise of stock options and restricted stock units, shares	450,613	450,613
Other Treasury Stock Issuances, Shares	0
Repurchases of Common Stock, Shares	(1,285,827)	(1,285,827)
Tax benefit resulting from exercise of certain employee stock options	6,737		6,737
Share-based compensation	12,270		12,270
Exercise of stock options and restricted stock units, Value	20,770			36,843	(16,073)
Repurchases of Common Stock, Value	(204,578)			(204,578)
Net earnings	269,493				269,493
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(2,117)					(2,117)
Other Comprehensive Income Foreign Currency Transaction and Translation Gain Loss Adjustment Net of Tax	(18,731)					(18,731)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(74,291)					(74,291)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	174,354
Ending balance at Dec. 31, 2011	$ 781,137	$ 448	$ 616,202	$ (1,225,125)	$ 1,476,550	$ (86,938)
Ending balance, shares at Dec. 31, 2011	31,590,101	31,590,101