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Net Income per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income $ 25,603 $ 22,328
Less: Net income allocated to unvested participating restricted stock (548) (748)
Net income available to common stockholders - basic 25,055 21,580
Effect of unvested participating restricted stock in two-class calculation 6 4
Net income available to common stockholders - diluted $ 25,061 $ 21,584
Weighted average outstanding shares of common stock - basic (in shares) 16,460 16,263
Dilutive effect of stock options (in shares) 170 207
Weighted average outstanding shares of common stock - diluted (in shares) 16,630 16,470
Net income per common share - basic (USD per share) $ 1.52 $ 1.33
Net income per common share - diluted (USD per share) $ 1.51 $ 1.31