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Capital Stock Transactions (Schedule Of Repurchased Capital Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Capital Stock Transactions [Abstract] |  |  |
Total cost of repurchased shares | $ 114,074 | $ 576,483 | $ 175,594
Shares repurchased | 232,500 | 1,195,529 | 384,252
Weighted average price per share | $ 490.64 | $ 482.20 | $ 456.98

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