Consolidated Statements Of Stockholders' Equity (Deficit) And Comprehensive Income (Loss) (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total [Member]
Balance at Dec. 31, 2011		$ 317	$ 20,135,237	$ (20,220,577)	$ (3,084)	$ (88,107)
Balance, shares at Dec. 31, 2011		159,422
Net income	320,032	0	0	320,032	0	320,032
Other Comprehensive Income (Loss), Net of Tax	2,696	0	0	0	2,696	2,696
Issuance of common stock under stock plans		2	29,301	0	0	29,303
Issuance of common stock under stock plans, shares		1,941
Stock-based compensation		0	36,199	0	0	36,199
Net excess income tax benefits associated with stock-based compensation and other		0	(16,045)	0	0	(16,045)
Repurchase of common stock		0	(325,680)	0	0	(325,680)
Stockholders' Equity, Other			189			189
Repurchase of common stock, shares		(7,971)
Balance at Dec. 31, 2012		319	19,891,291	(19,900,545)	(388)	(9,323)
Balance, shares at Dec. 31, 2012		153,392
Net income	544,450	0	0	544,450	0	544,450
Other Comprehensive Income (Loss), Net of Tax	(2,697)	0	0	0	(2,697)	(2,697)
Issuance of common stock under stock plans		1	20,666	0	0	20,667
Issuance of common stock under stock plans, shares		1,636
Stock-based compensation		0	39,642	0	0	39,642
Net excess income tax benefits associated with stock-based compensation and other		0	19,320	0	0	19,320
Repurchase of common stock		0	(1,035,617)	0	0	(1,035,617)
Repurchase of common stock, shares		(21,304)
Balance at Dec. 31, 2013	(423,558)	320	18,935,302	(19,356,095)	(3,085)	(423,558)
Balance, shares at Dec. 31, 2013	133,724	133,724
Net income	355,260	0	0	355,260	0	355,260
Other Comprehensive Income (Loss), Net of Tax	87	0	0	0	87	87
Issuance of common stock under stock plans		2	17,595	0	0	17,597
Issuance of common stock under stock plans, shares		1,341
Stock-based compensation		0	46,728	0	0	46,728
Net excess income tax benefits associated with stock-based compensation and other		0	3,823	0	0	3,823
Repurchase of common stock		0	(883,403)	0	0	(883,403)
Repurchase of common stock, shares		(16,613)
Balance at Dec. 31, 2014	$ (883,466)	$ 322	$ 18,120,045	$ (19,000,835)	$ (2,998)	$ (883,466)
Balance, shares at Dec. 31, 2014	118,452	118,452