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Net Income per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share, Basic [Abstract]    
Net income $ 43,469 $ 23,123
Average common shares outstanding (in shares) 31,870 32,850
Basic net income per common share (in dollars per share) $ 1.36 $ 0.70
Earnings Per Share, Diluted [Abstract]    
Net income $ 43,469 $ 23,123
Average common shares outstanding (in shares) 31,870 32,850
Adjustment for common share equivalents (in shares) 53 25
Average common shares outstanding-diluted (in shares) 31,923 32,875
Diluted net income per common share (in dollars per share) $ 1.36 $ 0.70
Anti-dilutive shares 4 26