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Capital Stock Repurchase Plan Transactions (Schedule Of Repurchased Capital Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Capital Stock Repurchase Plan Transactions [Abstract] |  |
Total cost of repurchased shares | $ 27,353 | $ 44,768
Shares repurchased | 57,500 | 100,000
Weighted average price per share | $ 475.71 | $ 447.67

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