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Earnings Per Common Share - Computation of basic and diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic earnings (loss) per common share:        
Net income (loss) $ 98,960 $ (84,935) $ 245,909 $ (60,825)
Weighted-average basic common shares 70,866 43,318 70,937 38,439
Basic earnings (loss) per common share (in dollars per share) $ 1.40 $ (1.96) $ 3.47 $ (1.58)
Diluted earnings (loss) per common share:        
Net income (loss) $ 98,960 $ (84,935) $ 245,909 $ (60,825)
Weighted-average basic common shares 70,866 43,318 70,937 38,439
Effect of dilutive securities (in shares) 543   508  
Weighted-average dilutive shares 71,409 43,318 71,445 38,439
Diluted earnings (loss) per common share (in dollars per share) $ 1.39 $ (1.96) $ 3.44 $ (1.58)