Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator for EPS:
Net Income	$ 8,256	$ 975	$ 25,906	$ 22,422
Less: Preferred stock dividends	(23)	(5)	(282)	(15)
Income available to common stockholders	$ 8,233	$ 970	$ 25,624	$ 22,407
Denominator for EPS:
Weighted average common shares outstanding	39,679	39,190	39,579	39,177
Plus: Assumed conversion of stock-based compensation (1)	282	651	390	870
Assumed conversion of preferred stock	489	489	489	489
Weighted average diluted common shares outstanding	40,450	40,330	40,458	40,536
Basic earnings per common share	$ 0.21	$ 0.02	$ 0.65	$ 0.57
Diluted earnings per common share	$ 0.20	$ 0.02	$ 0.64	$ 0.55

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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