Quarterly report pursuant to Section 13 or 15(d)

Net Income Per Share - Calculation (Details)

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Net Income Per Share - Calculation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net income $ 152,381 $ 135,870
Weighted average number of common shares outstanding - basic 31,641,454 31,550,658
Dilutive effect of common stock equivalents:    
Stock options 95,148 86,046
Weighted average number of common shares outstanding - diluted 31,843,818 31,713,239
Basic net income per common share $ 4.82 $ 4.31
Diluted net income per common share $ 4.79 $ 4.28
Service-based conditions    
Dilutive effect of common stock equivalents:    
Restricted stock awards 41,832 22,643
Market-based conditions    
Dilutive effect of common stock equivalents:    
Restricted stock awards 50,955 24,861
Performance-based conditions    
Dilutive effect of common stock equivalents:    
Restricted stock awards 14,429 29,031