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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator for EPS:
Net income	$ 4,406	$ 8,256	$ 7,777	$ 9,873	$ (2,313)	$ 975	$ 7,549	$ 13,898	$ 30,312	$ 20,109	$ 36,984
Less: Preferred stock dividends									(287)	(20)	(20)
Income available to common stockholders									$ 30,025	$ 20,089	$ 36,964
Denominator for EPS:
Weighted average common shares outstanding									39,614	39,184	39,113
Plus: Assumed conversion of stock-based compensation (1)									513	770	977
Assumed conversion of preferred stock									489	488	489
Weighted average diluted common shares outstanding									40,616	40,442	40,579
Basic earnings per common share	$ 0.11	$ 0.21	$ 0.20	$ 0.24	$ (0.06)	$ 0.02	$ 0.19	$ 0.35	$ 0.76	$ 0.51	$ 0.95
Diluted earnings per common share	$ 0.11	$ 0.20	$ 0.19	$ 0.24	$ (0.06)	$ 0.02	$ 0.19	$ 0.34	$ 0.75	$ 0.50	$ 0.91
Weighted average number of antidilutive shares									818	2,553	1,941