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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
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Net income $ 104,124 $ 96,733
Computation of basic and diluted net income per common share    
Weighted average common shares outstanding during the period (for basic calculation) (in shares) 39,608 39,593
Dilutive effect of other potential common shares (in shares) 348 245
Weighted average common shares and potential common shares (for diluted calculation) (in shares) 39,956 39,838
Net income per common share - Basic (in dollars per share) $ 2.63 $ 2.44
Net income per common share - Diluted (in dollars per share) $ 2.61 $ 2.43