Stock-Based Compensation (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of outstanding stock options and related activity
Outstanding shares, beginning balance	2,167	2,706	3,536
Outstanding weighted average exercise price, beginning balance	$ 11.03	$ 11.69	$ 11.29
Aggregate intrinsic value, beginning balance
Granted shares	826	25	20
Granted, weighted average exercise price	$ 1.39	$ 4.07	$ 10.51
Exercised shares	(32)	(7)	(760)
Exercised, weighted average exercise price	$ 0.50	$ 1.77	$ 9.55
Cancelled shares	(686)	(557)	(90)
Cancelled, weighted average exercise price	$ 12.37	$ 14.04	$ 13.80
Outstanding shares, Ending balance	2,275	2,167	2,706
Outstanding weighted average exercise price, Ending balance	$ 7.02	$ 11.03	$ 11.69
Aggregate intrinsic value, Ending balance
Exercisable, shares	1,474	2,167	2,545	2,754
Exercisable, weighted average exercise price	$ 10.09	$ 11.03	$ 11.54	$ 10.55
Vested and expected to vest, shares	2,171
Vested and expected to vest, weighted average exercise price	$ 7.29
Vested and expected to vest, Aggregate Intrinsic Value