CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Comprehensive Loss
Balance at Dec. 31, 2009	$ 121,502	$ 109	$ 901,818	$ (780,425)
Balance (in shares) at Dec. 31, 2009		10,904
Comprehensive loss:
Net loss	(18,177)			(18,177)		(18,177)
Comprehensive loss	(18,177)					(18,177)
Stock-based compensation	3,640		3,640
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of withholding taxes	(570)	3	(573)
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of withholding taxes (in shares)		304
Issuance of restricted stock		1	(1)
Issuance of restricted stock (in shares)		150
Exchange of preferred stock issued by a subsidiary to common stock issued by parent	3,958	5	3,953
Exchange of preferred stock issued by a subsidiary to common stock issued by parent (in shares)		535
Purchase of treasury stock	(8,532)				(8,532)
Purchase of treasury stock (in shares)					1,123
Balance at Dec. 31, 2010	101,821	118	908,837	(798,602)	(8,532)
Balance (in shares) at Dec. 31, 2010		11,893			1,123
Comprehensive loss:
Net loss	(59,503)			(59,503)		(59,503)
Comprehensive loss	(59,503)					(59,503)
Stock-based compensation	4,115		4,115
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of withholding taxes	(962)	3	(965)
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of withholding taxes (in shares)		276
Balance at Dec. 31, 2011	$ 45,471	$ 121	$ 911,987	$ (858,105)	$ (8,532)
Balance (in shares) at Dec. 31, 2011		12,169			1,123