CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2010	$ 520,203	$ 112	$ 2,397,671	$ (1,876,868)	$ (712)
Balance, Shares at Dec. 31, 2010		112,360,000
Net income	8,779			8,779
Other comprehensive loss, net of tax	(163)				(163)
Issuance of Common Stock under option, stock award and purchase plans	12,701	4	12,697
Issuance of Common Stock under option, stock award and purchase plans, Shares		3,897,000
Stock-based compensation	20,841		20,841
Excess tax benefits from stock-based compensation	1,955		1,955
Balance at Dec. 31, 2011	564,316	116	2,433,164	(1,868,089)	(875)
Balance, Shares at Dec. 31, 2011		116,257,000
Net income	(10,937)			(10,937)
Other comprehensive loss, net of tax	410				410
Issuance of Common Stock under option, stock award and purchase plans	4,536	3	4,533
Issuance of Common Stock under option, stock award and purchase plans, Shares		3,045,000
Repurchase of Common Stock	(22,639)	(5)	(22,634)
Repurchase of Common Stock, Shares		(5,109,000)
Stock-based compensation	18,926		18,926
Excess tax benefits from stock-based compensation	(1,199)		(1,199)
Balance at Dec. 31, 2012	553,413	114	2,432,790	(1,879,026)	(465)
Balance, Shares at Dec. 31, 2012		114,193,000
Net income	37,027			37,027
Other comprehensive loss, net of tax	256				256
Issuance of Common Stock under option, stock award and purchase plans	5,186	3	5,183
Issuance of Common Stock under option, stock award and purchase plans, Shares		3,482,000
Repurchase of Common Stock	(116,529)	(18)	(116,511)
Repurchase of Common Stock, Shares		(18,262,000)
Stock-based compensation	16,089		16,089
Excess tax benefits from stock-based compensation	(1,276)		(1,276)
Balance at Dec. 31, 2013	$ 494,166	$ 99	$ 2,336,275	$ (1,841,999)	$ (209)
Balance, Shares at Dec. 31, 2013		99,413,000