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, 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)	(26,586)				(26,586)
Other comprehensive income (loss)	(5,412)					(5,412)
Exercise of stock options and vesting of restricted stock units	14,421	2	14,419
Exercise of stock options and vesting of restricted stock units, shares		1,774
Share-based compensation expense	12,384		12,384
Tax benefit related to equity compensation plans	5,598		5,598
Repurchases of common stock	(19,238)			(19,238)
Repurchases of common stock, shares				(490)
Balance at Mar. 31, 2012	1,424,313	149	1,310,438	(2,042,367)	2,144,873	11,220
Balance, shares at Mar. 31, 2012		148,578		(65,337)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	50,050				50,050
Other comprehensive income (loss)	(16,708)					(16,708)
Exercise of stock options and vesting of restricted stock units	14,777	1	14,776
Exercise of stock options and vesting of restricted stock units, shares		1,246
Share-based compensation expense	9,935		9,935
Tax benefit related to equity compensation plans	(1,253)		(1,253)
Repurchases of common stock	(85,215)			(85,215)
Repurchases of common stock, shares				(3,220)
Balance at Mar. 31, 2013	$ 1,528,616	$ 150	$ 1,352,458	$ (2,177,840)	$ 2,343,572	$ 10,276
Balance, shares at Mar. 31, 2013		149,973		(70,646)