Stock-Based Compensation (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y
Summary of stock option activity
Number of options, Beginning balance	4,326,712
Weighted-average exercise price per option, Beginning Balance	$ 17.61
Number of options, Granted	711,800
Number of options, Exercised	(208,817)
Number of options, Forfeited or expired	(406,589)
Weighted-average exercise price per option, Granted	$ 15.17
Weighted-average exercise price per option, Exercised	$ 5.05
Weighted-average exercise price per option, Forfeited or expired	$ 22.15
Number of options, Ending balance	4,423,106
Weighted-average exercise price per option, Ending Balance	$ 17.40
Weighted-average remaining contractual term, Ending balance	5.0
Aggregate intrinsic value, Ending balance	$ 1,171
Options exercisable, Ending balance	2,857,916
Weighted-average exercise price per option exercisable, Ending balance	$ 26.93
Weighted-average remaining contractual term exercisable, Ending balance	3.2
Aggregate intrinsic value exercisable, Ending balance	261
Options vested or expected to vest, Ending balance	4,353,581
Weighted-average exercise price per option vested and expected to vest, Ending balance	$ 17.45
Weighted-average remaining contractual term vested or expected to vest, Ending balance	5.0
Aggregate intrinsic value vested or expected to vest, Ending balance	$ 1,161