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Capital Stock Repurchase Plan Transactions (Schedule Of Repurchased Capital Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Capital Stock Repurchase Plan Transactions [Abstract] |  |  |  |
Total cost of repurchased shares | $ 23,884 | $ 163,731 | $ 101,098 | $ 330,380
Shares repurchased | 50,000 | 350,000 | 207,500 | 700,000
Weighted average price per share | $ 477.68 | $ 467.80 | $ 487.22 | $ 471.97

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