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Earnings per Share - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net income $ 33,179 $ 12,532 $ 65,550 $ 26,945
Preferred stock dividends 10 10 20 20
Net income available to common equity 33,169 12,522 65,530 26,925
Dividends and undistributed earnings allocated to participating securities 31 10 63 26
Net income available to common shareholders $ 33,138 $ 12,512 $ 65,467 $ 26,899
Basic weighted-average shares outstanding 38,327 38,065 38,272 37,914
Stock options and other stock compensation 576 715 569 771
Diluted weighted-average shares outstanding 38,903 38,780 38,841 38,685
Antidilutive stock options 0 0 0 0
Earnings per share:        
Basic $ 0.86 $ 0.33 $ 1.71 $ 0.71
Diluted $ 0.85 $ 0.32 $ 1.69 $ 0.70