Consolidated Statements of Shareholders' Equity and Comprehensive Income (USD $) In Thousands, unless otherwise specified	Total	Common Stock Issued [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Fair Value of Hedging Instruments Adjustment [Member]	Accumulated Translation Adjustment [Member]	Accumulated Defined Benefit Plans Adjustment [Member]
Balance at Dec. 31, 2008	$ 967,654	$ 27,709	$ 210,390	$ (52,419)	$ 850,690	$ (3,057)	$ (63,489)	$ (2,170)
Balance, shares at Dec. 31, 2008		110,834
Stockholders' Equity [Roll Forward]
Net Income	188,353				188,353
Other Comprehensive Income	55,150					629	56,333	(1,812)
Restricted stock unit activity	8,763		(7,989)	16,752
Restricted stock activity	0		(1,781)	1,781
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	1,600
Stock options exercised	1,880		(4,210)	6,090
Tax benefits from stock plans	2,523		2,523
Cash dividends	0
Balance at Dec. 31, 2009	1,224,323	27,709	198,933	(27,796)	1,039,043	(2,428)	(7,156)	(3,982)
Balance, shares at Dec. 31, 2009		110,834
Stockholders' Equity [Roll Forward]
Net Income	200,531				200,531
Other Comprehensive Income	4,606					2,428	1,893	285
Restricted stock unit activity	7,841		(4,027)	11,868
Restricted stock activity	0		(1,781)	1,781
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	800
Stock options exercised	693		(1,589)	2,282
Tax benefits from stock plans	1,741		1,741
Cash dividends	0
Treasury stock purchases	(49,520)			(49,520)
Balance at Dec. 31, 2010	1,390,215	27,709	193,277	(61,385)	1,239,574	0	(5,263)	(3,697)
Balance, shares at Dec. 31, 2010		110,834
Stockholders' Equity [Roll Forward]
Net Income	235,658				235,658
Other Comprehensive Income	(18,231)					0	(18,374)	143
Restricted stock unit activity	15,199		9,532	5,667
Restricted stock activity	0		(1,509)	1,509
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	1,300		1,319
Tax benefits from stock plans	1,319
Cash dividends	48,707				(48,707)
Treasury stock purchases	(17,491)			(17,491)
Balance at Dec. 31, 2011	$ 1,557,962	$ 27,709	$ 202,619	$ (71,700)	$ 1,426,525	$ 0	$ (23,637)	$ (3,554)
Balance, shares at Dec. 31, 2011		110,834