Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net Income	$ 13,276	$ 11,880	$ 40,043	$ 32,681
Earnings allocated to participating securities - nonvested restricted shares	109	113	355	336
Earnings allocated to participating securities - preferred shares	27	0	58	0
Earnings allocated to common shareholders, Basic	13,140	11,767	39,630	32,345
Weighted average common shares outstanding	50,834	39,289	47,032	39,248
Basic earnings per common share	$ 0.26	$ 0.30	$ 0.84	$ 0.82
Dilutive effect of equity awards and warrants	1,463	2	915	3
Earnings allocated to common shareholders, Diluted	$ 13,142	$ 11,767	$ 39,635	$ 32,345
Weighted average diluted common shares outstanding	52,297	39,291	47,947	39,251
Diluted earnings per common share	$ 0.25	$ 0.30	$ 0.83	$ 0.82
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	138	53	99	46