Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, 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		146,804,000		(64,847,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	98,024				98,024
Other comprehensive income (loss)	(8,956)					(8,956)
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		1,877,000
Share-based compensation expense	18,067		18,067
Tax benefit (detriment) related to equity compensation plans	5,313		5,313
Repurchases of common stock	(33,143)			(33,143)
Repurchases of common stock, shares				(1,051,000)
Balance at Jun. 30, 2012	1,539,040	149	1,318,004	(2,056,272)	2,269,483	7,676
Balance, shares at Jun. 30, 2012		148,681,000		(65,898,000)
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		148,727,000		(67,426,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	83,533				83,533
Other comprehensive income (loss)	(62,593)					(62,593)
Exercise of stock options and vesting of restricted stock units	16,205	1	16,204
Exercise of stock options and vesting of restricted stock units, shares		1,325,000
Share-based compensation expense	16,877		16,877
Tax benefit (detriment) related to equity compensation plans	(1,332)		(1,332)
Repurchases of common stock	(85,496)			(85,496)
Repurchases of common stock, shares				(3,229,000)
Balance at Jun. 30, 2013	$ 1,524,224	$ 150	$ 1,360,749	$ (2,178,121)	$ 2,377,055	$ (35,609)
Balance, shares at Jun. 30, 2013		150,052,000		(70,655,000)