CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance, beginning at Dec. 31, 2010	$ 43	$ 453,353	$ (399,055)	$ (292)	$ (2,741)	$ 51,308
Balance, beginning (in shares) at Dec. 31, 2010	33,326				(200)
Net (loss) income			32,559			32,559
Other comprehensive income				8		8
Compensation expenses for share-based payment arrangements		3,273				3,273
Issuance of restricted stock, net of forfeitures (in shares)	(16)
Sale of common stock under employee stock purchase plans and exercise of stock options	1	2,318				2,319
Sale of common stock under employee stock purchase plans and exercise of stock options (in shares)	482
Balance, ending at Jun. 30, 2011	44	458,944	(366,496)	(284)	(2,741)	89,467
Balance, ending (in shares) at Jun. 30, 2011	33,792				(200)
Balance, beginning at Dec. 31, 2011	44	463,440	(388,674)	(268)	(2,741)	71,801
Balance, beginning (in shares) at Dec. 31, 2011	34,046				(200)
Net (loss) income			(23,806)			(23,806)
Other comprehensive income				8		8
Compensation expenses for share-based payment arrangements		4,796				4,796
Issuance of restricted stock, net of forfeitures (in shares)	(2)
Exercise of stock options		172				172
Exercise of stock options (in shares)	33
Balance, ending at Jun. 30, 2012	$ 44	$ 468,408	$ (412,480)	$ (260)	$ (2,741)	$ 52,971
Balance, ending (in shares) at Jun. 30, 2012	34,077				(200)