Consolidated Statements of Stockholders' Equity and Comprehensive Income (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings (Accumulated Deficit)	Stockholders' Equity, Total [Member]
Balances at Dec. 31, 2010		$ 457	$ 1,273,853	$ 16,329	$ (237,583)	$ 1,053,056
Balances (in shares) at Dec. 31, 2010		456,788
Increase (Decrease) in Stockholders' Equity
Net income (loss)	314,990				314,990	314,990
Other Comprehensive Income (Loss)	(6,881)			(6,881)		(6,881)
Share-based compensation expense			69,102			69,102
Tax benefit on share-based compensation expense			939			939
Exercise of stock options		4	19,336			19,340
Exercise of stock options (in shares)		4,285
Issuance of common stock under employee stock purchase plan		2	9,404			9,406
Issuance of common stock under employee stock purchase plan (in shares)		1,514
Vested restricted stock units		6				6
Vested restricted stock units (in shares)		6,345
Vested performance restricted stock units		8				8
Vested performance-based restricted stock units (in shares)		8,485
Shares withheld for employee taxes related to vested restricted stock units		(6)	(73,280)			(73,286)
Shares withheld for employee taxes related to vested restricted stock units (in shares)		(6,252)
Repurchase of common stock	(304,200)	(29)	(304,207)			(304,236)
Repurchase of common stock (in shares)	(28,800)	(28,776)
Balances at Dec. 31, 2011		442	995,147	9,448	77,407	1,082,444
Balances (in shares) at Dec. 31, 2011		442,389
Increase (Decrease) in Stockholders' Equity
Net income (loss)	30,445				30,445	30,445
Other Comprehensive Income (Loss)	(3,036)			(3,036)		(3,036)
Share-based compensation expense			71,974			71,974
Equity related restructuring charges			413			413
Tax benefit on share-based compensation expense			(1,738)			(1,738)
Exercise of stock options		2	4,578			4,580
Exercise of stock options (in shares)	0	1,239
Issuance of common stock under employee stock purchase plan		2	10,955			10,957
Issuance of common stock under employee stock purchase plan (in shares)		1,770
Vested restricted stock units		8				8
Vested restricted stock units (in shares)		7,975
Shares withheld for employee taxes related to vested restricted stock units		(2)	(19,828)			(19,830)
Shares withheld for employee taxes related to vested restricted stock units (in shares)		(2,100)
Repurchase of common stock	(179,600)	(23)	(179,556)			(179,579)
Repurchase of common stock (in shares)	(22,700)	(22,680)
Balances at Dec. 31, 2012	996,638	429	881,945	6,412	107,852	996,638
Balances (in shares) at Dec. 31, 2012		428,593
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(22,055)					(22,055)
Other Comprehensive Income (Loss)	6,385			6,385		6,385
Share-based compensation expense			42,454			42,454
Equity related restructuring charges			566			566
Tax benefit on share-based compensation expense			(913)			(913)
Exercise of stock options		3	12,340			12,343
Exercise of stock options (in shares)	0	2,990
Issuance of common stock under employee stock purchase plan		2	10,603			10,605
Issuance of common stock under employee stock purchase plan (in shares)		1,920
Vested restricted stock units		7				0
Vested restricted stock units (in shares)		7,335
Restricted stock vested (classify from APIC to common stock)			(7)
Shares withheld for employee taxes related to vested restricted stock units		4	20,311			20,315
Shares withheld for employee taxes related to vested restricted stock units (in shares)		(3,256)
Repurchase of common stock	(87,800)	(12)	(87,769)			(87,781)
Repurchase of common stock (in shares)	(12,200)	(12,192)
Balances at Dec. 31, 2013	$ 937,927	$ 425	$ 838,908	$ 12,797	$ 85,797	$ 937,927
Balances (in shares) at Dec. 31, 2013		425,390