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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
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Capital Stock Repurchase Plan Transactions [Abstract] |  |  |  |
Total cost of repurchased shares | $ 42,945 | $ 55,769 | $ 72,701 | $ 88,113
Shares repurchased | 75,000 | 100,000 | 125,000 | 150,000
Weighted average price per share | $ 572.61 | $ 557.68 | $ 581.62 | $ 587.41

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