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 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Net income $ 150,723 $ 152,381 $ 164,400 $ 135,870 $ 303,104 $ 300,270
Weighted average number of common shares outstanding - basic 31,324,833   31,599,744   31,483,144 31,575,337
Dilutive effect of common stock equivalents:            
Stock options 91,516   84,998   93,332 85,522
Weighted average number of common shares outstanding - diluted 31,524,063   31,731,807   31,693,524 31,722,660
Basic net income per common share $ 4.81   $ 5.20   $ 9.63 $ 9.51
Diluted net income per common share $ 4.78   $ 5.18   $ 9.56 $ 9.47
Service-based conditions            
Dilutive effect of common stock equivalents:            
Restricted stock awards 34,973   25,052   38,083 23,848
Market-based conditions            
Dilutive effect of common stock equivalents:            
Restricted stock awards 61,856   20,039   61,491 22,450
Performance-based conditions            
Dilutive effect of common stock equivalents:            
Restricted stock awards 10,885   1,974   17,474 15,503