Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net loss available to common stockholders	$ (4,813)	$ (134,481)	$ (21,320)	$ (150,081)
Denominator:
Weighted average shares outstanding - basic	35,879	35,728	35,838	35,590
Potential common shares - options (treasury stock method)
Weighted average shares outstanding - diluted	35,879	35,728	35,838	35,590
Shares excluded (anti-dilutive)		56	3	231
Shares excluded due to an exercise price greater than weighted average stock price for the period	1,453	2,237	1,453	1,738
Net loss per common share:
Basic	$ (0.13)	$ (3.76)	$ (0.59)	$ (4.22)
Diluted	$ (0.13)	$ (3.76)	$ (0.59)	$ (4.22)