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Capital Stock Repurchase Plan Transactions (Schedule Of Repurchased Capital Stock) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Capital Stock Repurchase Plan Transactions [Abstract]        
Total cost of repurchased shares $ 55,769 $ 13,425 $ 88,113 $ 13,425
Shares repurchased 100,000 25,000 150,000 25,000
Weighted average price per share $ 557.68 $ 536.98 $ 587.41 $ 536.98