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Earnings Per Share (Basic and Diluted Earnings per 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 $ 313,217 $ 341,790 $ 291,644 $ 257,138 $ 259,942 $ 158,294 $ 946,651 $ 675,374
Weighted-average number of common shares outstanding (for basic calculation) 27,550     27,773     27,593 27,907
Dilutive stock awards 131     183     146 209
Weighted-average number of common shares outstanding (for diluted calculation) 27,681     27,956     27,739 28,116
Basic earnings per share $ 11.37     $ 9.26     $ 34.31 $ 24.20
Diluted earnings per share $ 11.32     $ 9.20     $ 34.13 $ 24.02