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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
Mar. 31, 2020
Mar. 31, 2019
Weighted-average shares:    
Basic weighted-average common shares outstanding 36,024 35,698
Total weighted-average shares 36,119 35,802
Earnings per common share—Basic    
Net income $ 28,954 $ 19,198
Net income available to common shareholders—Basic $ 28,878 $ 19,142
Net income per common share—Basic $ 0.80 $ 0.54
Basic weighted-average common shares outstanding 36,024 35,698
Effect of diluted shares 2,006 1,587
Diluted weighted-average shares outstanding 38,030 37,285
Net income per common share—Diluted $ 0.76 $ 0.51
RSAs    
Weighted-average shares:    
Basic weighted-average common shares outstanding 95 104
Earnings per common share—Basic    
Less: Undistributed earnings allocated to RSAs $ 76 $ 56
Basic weighted-average common shares outstanding 95 104
Common Stock    
Weighted-average shares:    
Basic weighted-average common shares outstanding 36,024 35,698
Earnings per common share—Basic    
Basic weighted-average common shares outstanding 36,024 35,698