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Earnings Per Share - Summary of Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Basic weighted average number of shares outstanding 12,689,191 12,640,463 12,634,464 12,768,096
Net dilutive effect of share-based awards, treasury method [1] 991,955 484,192 861,125 501,398
Diluted weighted average number of shares outstanding 13,681,146 13,124,655 13,495,589 13,269,494
Net Income (Loss) Attributable to Parent $ 31,159 $ 17,649 $ 69,817 $ 25,467
Diluted $ 2.46 $ 1.40 $ 5.53 $ 1.99
Net loss per share (in dollars per share) $ 2.28 $ 1.34 $ 5.17 $ 1.92
[1] 10,770 shares of Class A Stock granted under share-based compensation arrangements.