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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
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Net income $ 359,287 $ 291,644
Weighted-average number of common shares outstanding (for basic calculation) (in shares) 27,444 27,624
Dilutive stock awards (in shares) 180 164
Weighted-average number of common shares outstanding (for diluted calculation) (in shares) 27,624 27,788
Basic earnings per share (in usd per share) $ 13.09 $ 10.56
Diluted earnings per share (in usd per share) $ 13.01 $ 10.50