Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	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, 2013	$ 1,628,811	$ 150	$ 1,377,624	$ (2,179,744)	$ 2,463,648	$ (32,867)
Balance, shares at Dec. 31, 2013		150,224		(70,704)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	140,715				140,715
Other comprehensive loss	33,643					33,643
Exercise of stock options and vesting of restricted stock units	31,499	$ 2	31,497
Exercise of stock options and vesting of restricted stock units, shares		2,052
Share-based compensation expense	21,809		21,809
Tax benefit related to equity compensation plans	1,583		1,583
Repurchases of common stock	(92,436)			$ (92,436)
Repurchases of common stock, shares				(2,143)
Balance at Sep. 30, 2014	1,765,624	$ 152	1,432,513	$ (2,272,180)	2,604,363	776
Balance, shares at Sep. 30, 2014		152,276		(72,847)
Balance at Dec. 31, 2014	1,709,222	$ 153	1,444,705	$ (2,341,652)	2,609,277	(3,261)
Balance, shares at Dec. 31, 2014		152,451		(74,378)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	148,609				148,609
Other comprehensive loss	(2,427)					(2,427)
Exercise of stock options and vesting of restricted stock units	18,269	$ 1	18,268
Exercise of stock options and vesting of restricted stock units, shares		1,285
Share-based compensation expense	21,459		21,459
Tax benefit related to equity compensation plans	5,100		5,100
Repurchases of common stock	(112,415)			$ (112,415)
Repurchases of common stock, shares				(2,067)
Balance at Sep. 30, 2015	$ 1,787,817	$ 154	$ 1,489,532	$ (2,454,067)	$ 2,757,886	$ (5,688)
Balance, shares at Sep. 30, 2015		153,736		(76,445)