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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net Income $ 21,259 $ 24,361
Earnings allocated to participating securities - preferred shares 39 43
Earnings allocated to participating securities - nonvested restricted shares 247 225
Earnings allocated to common shareholders, Basic $ 20,973 $ 24,093
Weighted average common shares outstanding 57,114 56,965
Basic earnings per common share $ 0.37 $ 0.42
Earnings allocated to common shareholders, Diluted [1] $ 20,973 $ 24,093
Dilutive effect of equity awards and warrants 11 13
Weighted average diluted common shares outstanding 57,125 56,978
Diluted earnings per common share $ 0.37 $ 0.42
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive. 27 53
[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.