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Earnings Per Common Share - Computation of basic and diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic earnings per common share:      
Net income $ 475,543 $ 120,632 $ 186,483
Weighted-average basic common shares 70,393 54,756 34,561
Basic earnings per common share (in dollars per share) $ 6.76 $ 2.20 $ 5.40
Diluted earnings per common share:      
Net income $ 475,543 $ 120,632 $ 186,483
Weighted-average basic common shares 70,393 54,756 34,561
Effect of dilutive securities (in shares) 496 307 236
Weighted-average dilutive shares 70,889 55,063 34,797
Diluted earnings per common share (in dollars per share) $ 6.71 $ 2.19 $ 5.36