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 Income (Loss) [Member]
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 (loss)	11,917				11,917
Other comprehensive income (loss)	7,614					7,614
Exercise of stock options and vesting of restricted stock units	27,211	2	27,209
Exercise of stock options and vesting of restricted stock units, shares		1,604
Share-based compensation expense	21,345		21,345
Tax benefit related to equity compensation plans	1,113		1,113
Repurchases of common stock	(325,212)			(325,212)
Repurchases of common stock, shares				(11,706)
Balance at Sep. 30, 2011	1,438,404	147	1,270,968	(1,952,068)	2,111,256	8,101
Balance, shares at Sep. 30, 2011		146,725		(62,180)
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 (loss)	116,052				116,052
Other comprehensive income (loss)	11,299					11,299
Exercise of stock options and vesting of restricted stock units	16,589	2	16,587
Exercise of stock options and vesting of restricted stock units, shares		1,885
Share-based compensation expense	23,413		23,413
Tax benefit related to equity compensation plans	5,113		5,113
Repurchases of common stock	(69,330)			(69,330)
Repurchases of common stock, shares				(2,572)
Balance at Sep. 30, 2012	$ 1,546,282	$ 149	$ 1,323,150	$ (2,092,459)	$ 2,287,511	$ 27,931
Balance, shares at Sep. 30, 2012		148,689		(67,419)