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Net Income Per Common Share - Computation of Basic and Diluted Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]                
Net income $ 143,068 $ 146,320 $ 96,733 $ 219,587 $ 218,111 $ 302,600 $ 386,121 $ 740,298
Computation of basic and diluted net income per common share                
Weighted average common shares outstanding during the period (for basic calculation) (in shares) 39,675     39,544     39,648 39,521
Dilutive effect of other potential common shares (in shares) 308     232     201 241
Weighted average common shares and potential common shares (for diluted calculation) (in shares) 39,983     39,776     39,849 39,762
Net income per common share - Basic (in dollars per share) $ 3.61     $ 5.55     $ 9.74 $ 18.73
Net income per common share - Diluted (in dollars per share) $ 3.58     $ 5.52     $ 9.69 $ 18.62