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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net Income $ 51,724 $ 41,749 $ 97,595 $ 81,719
Earnings allocated to participating securities - nonvested restricted shares 378 473 838 909
Earnings allocated to common shareholders, Basic $ 51,346 $ 41,276 $ 96,757 $ 80,810
Weighted average common shares outstanding 72,451 72,385 72,486 72,343
Basic earnings per common share $ 0.71 $ 0.57 $ 1.33 $ 1.12
Earnings allocated to common shareholders, Diluted $ 51,346 $ 41,276 $ 96,757 $ 80,810
Dilutive effect of equity awards and warrants 0 5 1 4
Weighted average diluted common shares outstanding 72,451 72,390 72,487 72,347
Diluted earnings per common share $ 0.71 $ 0.57 $ 1.33 $ 1.12
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive. 0 3 0 7