Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Earnings Per Share [Abstract]
Net Income	$ 21,227		$ 14,591		$ 41,071		$ 26,767
Earnings allocated to participating securities - nonvested restricted shares	206		124		378		244
Earnings allocated to participating securities - preferred shares	41		29		79		30
Earnings allocated to common shareholders, Basic	20,980		14,438		40,614		26,493
Weighted average common shares outstanding	52,088		50,788		51,600		45,099
Basic earnings per common share	$ 0.40		$ 0.28		$ 0.79		$ 0.59
Dilutive effect of equity awards and warrants	406		1,337		863		659
Earnings allocated to common shareholders, Diluted	$ 20,981	[1]	$ 14,441	[1]	$ 40,617	[1]	$ 26,495	[1]
Weighted average diluted common shares outstanding	52,494		52,125		52,463		45,758
Diluted earnings per common share	$ 0.40		$ 0.28		$ 0.77		$ 0.58
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	63		143		73		76

[1] Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.