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Net Income per Share - Shares and EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of basic earnings per share ("EPS") to diluted EPS      
Net income $ 353,987 $ 333,995 $ 266,447
Dilutive effect of potential common stock equivalents - stock options (in shares) 239 122 207
Net earnings per share:      
Earnings per share, basic (in shares) $ 8.31 $ 7.78 $ 6.15
Earnings per share, diluted (in shares) $ 8.26 $ 7.76 $ 6.12