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Earnings Per Share (Schedule Of Computation Of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Earnings $ 301,999 $ 272,509 $ 249,624
Diluted earnings $ 301,999 $ 272,509 $ 249,624
Earnings, Shares 15,024 15,050 14,929
Dilutive stock options, Shares 114 103 130
Nonvested stock awards, Shares 48 47 40
Diluted earnings, Shares 15,186 15,200 15,099
Earnings, Earnings per Share $ 20.10 $ 18.11 $ 16.72
Diluted earnings, Earnings per Share $ 19.89 $ 17.93 $ 16.53