Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Common Stock Held In Treasury [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Balance at Dec. 31, 2009	$ 1,695,783	$ 154	$ 1,190,203	$ (1,389,722)	$ 1,895,096	$ 52
Balance, shares at Dec. 31, 2009		144,175		(41,020)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	204,243				204,243
Other comprehensive income	435					435
Exercise of stock options and vesting of restricted stock units, shares		946
Exercise of stock options and vesting of restricted stock units	3,644	(9)	3,653
Share-based compensation expense	33,112		33,112
Tax benefit (detriment) related to equity compensation plans	(5,667)		(5,667)
Repurchases of common stock, shares				(9,454)
Repurchases of common stock	(237,134)			(237,134)
Balance at Dec. 31, 2010	1,694,416	145	1,221,301	(1,626,856)	2,099,339	487
Balance, shares at Dec. 31, 2010		145,121		(50,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	72,120				72,120
Other comprehensive income	16,145					16,145
Exercise of stock options and vesting of restricted stock units, shares		1,683
Exercise of stock options and vesting of restricted stock units	28,320	2	28,318
Share-based compensation expense	27,602		27,602
Tax benefit (detriment) related to equity compensation plans	816		816
Repurchases of common stock, shares				(14,373)
Repurchases of common stock	(396,273)			(396,273)
Balance at Dec. 31, 2011	1,443,146	147	1,278,037	(2,023,129)	2,171,459	16,632
Balance, shares at Dec. 31, 2011		146,804		(64,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	122,063				122,063
Other comprehensive income	10,352					10,352
Exercise of stock options and vesting of restricted stock units, shares		1,923
Exercise of stock options and vesting of restricted stock units	16,942	2	16,940
Share-based compensation expense	28,893		28,893
Tax benefit (detriment) related to equity compensation plans	5,130		5,130
Repurchases of common stock, shares				(2,579)
Repurchases of common stock	(69,496)			(69,496)
Balance at Dec. 31, 2012	$ 1,557,030	$ 149	$ 1,329,000	$ (2,092,625)	$ 2,293,522	$ 26,984
Balance, shares at Dec. 31, 2012		148,727		(67,426)