Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator for EPS:
Net Income	$ 7,777	$ 7,549	$ 17,650	$ 21,447
Preferred stock dividends	(5)	(5)	(259)	(10)
Income available to common stockholders	$ 7,772	$ 7,544	$ 17,391	$ 21,437
Denominator for EPS:
Weighted average common shares outstanding	39,668	39,187	39,528	39,187
Plus: Assumed conversion of stock-based compensation	221	970	444	981
Assumed conversion of preferred stock	488	488	488	489
Weighted average diluted common shares outstanding	40,377	40,645	40,460	40,657
Basic earnings per common share	$ 0.20	$ 0.19	$ 0.44	$ 0.55
Diluted earnings per common share	$ 0.19	$ 0.19	$ 0.44	$ 0.53

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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