Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		383 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012
Weighted-average number of common shares and dilutive common stock equivalent shares outstanding:
Net income (loss)	$ 8,038	$ 1,279	$ (9,666)	$ 3,112	$ (319,630)
Weighted-average number of shares of common stock and common stock equivalents outstanding:
Weighted-average number of common shares outstanding for computing basic earnings per share	22,624	22,348	22,624	20,558
Dilutive effect of warrants and stock options after application of the treasury stock method	34	805		1,112
Weighted-average number of common shares outstanding for computing diluted earnings per share	22,658	23,153	22,624	21,670
Net income (loss) per share - basic	$ 0.36	$ 0.06	$ (0.43)	$ 0.15
Net income (loss) per share - dilutive	$ 0.35	$ 0.06	$ (0.43)	$ 0.14