Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Common Share
Net income	$ 66,593	$ 53,091	$ 67,209
Preferred stock dividends	(7,214)
Net income available to common shareholders	59,379	53,091	67,209
Income allocated to participating securities	(720)	(463)	(1,685)
Net income allocated to common shareholders	$ 58,659	$ 52,628	$ 65,524
Basic weighted average common shares outstanding	97,121,497	95,455,344	93,253,928
Diluted weighted average common shares outstanding	97,121,497	95,455,344	93,253,928
Basic EPS (in dollars per share)	$ 0.60	$ 0.55	$ 0.70
Diluted EPS (in dollars per share)	$ 0.60	$ 0.55	$ 0.70
Stock options excluded from computation of earnings per share (in shares)	2,096,708	5,495,748	6,846,339
Restricted stock units
Stock Incentive Plans
Outstanding (in shares)		0	0