Earnings (Loss) per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ (1,813)	$ 30,713
Less: income allocated to preferred stockholders	0	27
Net income (loss) allocated to common stockholders	$ (1,813)	$ 30,686
Weighted average shares for basic EPS (in shares)	28,292	26,834
Add: incremental shares from assumed conversions of stock options (in shares)	0	262
Weighted average shares for diluted EPS (in shares)	28,292	27,096
Basic earnings (loss) per share attributable to common stockholders (in dollars per share)	$ (0.06)	$ 1.14
Diluted earnings (loss) per share attributable to common stockholders (in dollars per share)	$ (0.06)	$ 1.13