Stock-Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options
Shares, Exercised	(22,000)
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options
Shares, options outstanding, Beginning Balance	5,365,085
Shares, Granted	140,848
Shares, Exercised	(1,250)
Shares, Forfeited/Expired	(714,409)
Shares, options outstanding, Ending Balance	4,790,274
Shares, Vested or expected to vest	4,641,553
Shares, Options exercisable	1,303,523
Weighted average exercise price, Options outstanding, Beginning Balance	23.45
Weighted-Average Exercise Price, Granted	16.75
Weighted-Average Exercise Price, Exercised	17.36
Weighted-Average Exercise Price, Forfeited/Expired	29.83
Weighted average exercise price, Options outstanding, Ending Balance	22.30
Weight Average Exercise Price, Vested or expected to vest	22.35
Weighted average exercise price, Options exercisable	26.48
Weighted average remaining contractual term, Options outstanding	7 years 1 month 2 days
Weighted average remaining contractual term, Vested or expected to vest	7 years 7 days
Weighted average remaining contractual term, Options exercisable	5 years 11 months 27 days
Aggregate intrinsic value, Options outstanding	1,698
Aggregate intrinsic value, Vested or expected to vest	1,698
Aggregate intrinsic value, Options exercisable	1,037