Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator
Net income (loss)	$ (1,289)	$ 16,187	$ (68,295)	$ 11,367
Preferred dividend		(2,196)	(3,522)	(3,500)
Warrant amortization		(1,545)	(731)	(687)
Net income (loss) available to common shareholders		12,446	(72,548)	7,180
Earnings allocated to participating securities				(36)
Numerator for basic earnings per common share		12,446	(72,548)	7,144
Numerator for diluted earnings per common share		$ 12,446	$ (72,548)	$ 7,144
Denominator
Weighted average common shares outstanding		19,374,098	19,414,231	17,848,610
Effect of dilutive securities:
Stock options				16,581
Denominator for diluted earnings per common share		19,374,098	19,414,231	17,865,191
Earnings per common share:
Basic	$ (0.12)	$ 0.64	$ (3.73)	$ 0.40
Diluted	$ (0.12)	$ 0.64	$ (3.73)	$ 0.40