Consolidated Statements Of Stockholders' Equity (Deficit) And Comprehensive Income (Loss) - USD ($) shares in Thousands, $ 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, 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		$ 320	18,935,302	(19,356,095)	(3,085)	(423,558)
Balance, shares at Dec. 31, 2013		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
Net income	$ 375,236	$ 0	0	375,236	0	375,236
Other Comprehensive Income (Loss), Net of Tax	(995)	0	0	0	(995)	(995)
Issuance of common stock under stock plans		$ 1	14,689	0	0	14,690
Issuance of common stock under stock plans, shares		1,291
Stock-based compensation		$ 0	48,793	0	0	48,793
Net excess income tax benefits associated with stock-based compensation and other		0	18,464	0	0	18,464
Repurchase of common stock		$ 0	(643,169)	0	0	(643,169)
Repurchase of common stock, shares		(9,671)
Balance at Dec. 31, 2015	$ (1,070,447)	$ 323	$ 17,558,822	$ (18,625,599)	$ (3,993)	$ (1,070,447)
Balance, shares at Dec. 31, 2015	110,072	110,072