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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 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]            
Net income $ 341,790 $ 291,644 $ 259,942 $ 158,294 $ 633,434 $ 418,236
Weighted-average number of common shares outstanding (for basic calculation) 27,604   27,905   27,614 27,974
Dilutive stock awards 143   187   154 222
Weighted-average number of common shares outstanding (for diluted calculation) 27,747   28,092   27,768 28,196
Basic earnings per share $ 12.38   $ 9.32   $ 22.94 $ 14.95
Diluted earnings per share $ 12.32   $ 9.25   $ 22.81 $ 14.83