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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]            
Net income $ 118,134 $ 99,658 $ 55,624 $ 42,839 $ 217,792 $ 98,463
Basic weighted average shares outstanding 24,844,644   25,074,826   24,897,462 25,198,952
Stock-based compensation units 217,168   78,250   241,229 167,154
Diluted weighted average shares outstanding 25,061,812   25,153,076   25,138,691 25,366,106
Basic earnings per share (in dollars per share) $ 4.75   $ 2.22   $ 8.75 $ 3.91
Diluted earnings per share (in dollars per share) $ 4.71   $ 2.21   $ 8.66 $ 3.88
Antidilutive non-vested restricted stock units excluded from calculation of diluted earnings per share 835   2,267   8,043 9,808