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Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net income $ 483,656 $ 857,658 $ 712,486
Computation of basic and diluted net income per common share      
Weighted average common shares outstanding during the period (for basic calculation) (in shares) 39,649 39,526 39,420
Dilutive effect of other potential common shares (in shares) 252 246 226
Weighted average common shares and potential common shares (for diluted calculation) (in shares) 39,901 39,772 39,646
Net income per common share - Basic (in dollars per share) $ 12.20 $ 21.70 $ 18.07
Net income per common share - Diluted (in dollars per share) $ 12.12 $ 21.56 $ 17.97