Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Net income (loss)	$ (1,000)	$ 860	$ (1,031)	$ 4,589	$ 30,713
Less: income allocated to preferred stockholders	0	(1)	0	(4)
Net income (loss) allocated to common stockholders	$ (1,000)	$ 859	$ (1,031)	$ 4,585
Weighted average shares for basic EPS (in shares)	28,593	27,088	28,072	26,739
Add: incremental shares from assumed conversions of stock options (in shares)	0	293	0	251
Weighted average shares for diluted EPS (in shares)	28,593	27,381	28,072	26,990
Basic and diluted earnings (loss) per share attributable to common stockholders (in dollars per share)	$ (0.03)	$ 0.03	$ (0.04)	$ 0.17