Consolidated Statement of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Additional paid-in capital	Accumulated comprehensive income (deficit)
BALANCE at Dec. 31, 2009	$ 187,979	$ 33	$ 183,756	$ 4,190
BALANCE, Shares at Dec. 31, 2009		33,380
Exercise of common stock options, shares	760	760
Exercise of common stock options	7,255	1	7,254
Non cash compensation recognized on stock options and ESPP	4,559		4,559
Restricted stock grants, net of cancellations, shares		868
Restricted stock grants, net of cancellations	4,937	1	4,936
Cancellation of shares for payment of withholding tax, shares		(37)
Cancellation of shares for payment of withholding tax	(331)		(331)
Tax benefit related to the exercise of stock options	1,543		1,543
Tax benefit deficiencies related to restricted stock expense	(15)		(15)
Comprehensive income (loss)	12,338			12,338
BALANCE at Dec. 31, 2010	218,265	35	201,702	16,528
BALANCE, Shares at Dec. 31, 2010		34,971
Exercise of common stock options, shares	7	7
Exercise of common stock options	12		12
Non cash compensation recognized on stock options and ESPP	973		973
Restricted stock grants, net of cancellations, shares		575
Restricted stock grants, net of cancellations	5,557	1	5,556
Cancellation of shares for payment of withholding tax, shares		(37)
Cancellation of shares for payment of withholding tax	(303)		(303)
Tax benefit deficiencies related to restricted stock expense	(426)		(426)
Employee stock purchase plan, shares		96
Employee stock purchase plan	413		413
Comprehensive income (loss)	(159,631)			(159,631)
BALANCE at Dec. 31, 2011	64,860	36	207,927	(143,103)
BALANCE, Shares at Dec. 31, 2011		35,612
Exercise of common stock options, shares	32	32
Exercise of common stock options	16		16
Non cash compensation recognized on stock options and ESPP	66		66
Restricted stock grants, net of cancellations, shares		574
Restricted stock grants, net of cancellations	3,883		3,883
Cancellation of shares for payment of withholding tax, shares		(23)
Cancellation of shares for payment of withholding tax	(40)		(40)
Employee stock purchase plan, shares		53
Employee stock purchase plan	66		66
Shares repurchased and cancelled, shares		(375)
Shares repurchased and cancelled	(753)		(753)
Comprehensive income (loss)	(25,436)			(25,436)
BALANCE at Dec. 31, 2012	$ 42,662	$ 36	$ 211,165	$ (168,539)
BALANCE, Shares at Dec. 31, 2012		35,873