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Earnings Per Share (Schedule Of Computation Of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]    
Earnings $ 54,121 $ 64,169
Diluted earnings $ 54,121 $ 64,169
Earnings, Shares 14,966 14,986
Dilutive stock options, Shares 94 165
Nonvested stock awards, Shares 50 41
Diluted earnings, Shares 15,110 15,192
Earnings, Earnings per Share $ 3.62 $ 4.28
Diluted earnings, Earnings per Share $ 3.58 $ 4.22