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Earnings Per Share - Computation of basic and diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Basic earnings per common share:    
Net income $ 100,329 $ 146,949
Weighted-average basic common shares 71,447 71,009
Basic earnings per common share (in dollars per share) $ 1.40 $ 2.07
Diluted earnings per common share:    
Net income $ 100,329 $ 146,949
Weighted-average basic common shares 71,447 71,009
Effect of dilutive securities (in shares) 664 475
Weighted-average dilutive shares 72,111 71,484
Diluted earnings per common share (in dollars per share) $ 1.39 $ 2.06