Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Net income (loss)	$ (421)	$ 3,540	$ (31)	$ 3,729	$ 30,713
Less: income allocated to preferred stockholders	0	(3)	0	(3)
Net income (loss) allocated to common stockholders	$ (421)	$ 3,537	$ (31)	$ 3,726
Weighted average common shares outstanding for basic EPS (in thousands) (in shares)	28,135	26,997	27,809	26,562
Add: incremental shares from assumed conversions of stock options	0	232	0	121
Weighted average shares for diluted EPS	28,135	27,229	27,809	26,683
Basic and diluted earnings (loss) per share attributable to common stockholders	$ (0.01)	$ 0.13	$ 0.00	$ 0.14