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Net Income Per Share - Schedule of Reconciliation of Denominators and Additional Shares that are Excluded from the Calculation of EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Weighted-average shares:            
Basic weighted-average common shares outstanding 35,386   35,839   35,705 35,772
Total weighted-average shares 35,481   35,941   35,800 35,875
Earnings per common share—Basic            
Net income $ 24,104 $ 28,954 $ 27,455 $ 19,198 $ 53,058 $ 46,653
Net income available to common shareholders—Basic $ 24,039   $ 27,377   $ 52,917 $ 46,519
Net income per common share—Basic $ 0.68   $ 0.76   $ 1.48 $ 1.30
Basic weighted-average common shares outstanding 35,386   35,839   35,705 35,772
Effect of diluted shares 1,942   1,550   1,975 1,605
Diluted weighted-average shares outstanding 37,328   37,389   37,680 37,377
Net income per common share—Diluted $ 0.64   $ 0.73   $ 1.40 $ 1.24
RSAs            
Weighted-average shares:            
Basic weighted-average common shares outstanding 95   102   95 103
Earnings per common share—Basic            
Less: Undistributed earnings allocated to RSAs $ 65   $ 78   $ 141 $ 134
Basic weighted-average common shares outstanding 95   102   95 103
Common Stock            
Weighted-average shares:            
Basic weighted-average common shares outstanding 35,386   35,839   35,705 35,772
Earnings per common share—Basic            
Basic weighted-average common shares outstanding 35,386   35,839   35,705 35,772