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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Capital Stock Repurchase Plan Transactions [Abstract] |  |  |  |
Total cost of repurchased shares | $ 21,914 | $ 22,676 | $ 122,148 | $ 71,926
Shares repurchased | 50,000 | 69,009 | 275,000 | 219,009
Weighted average price per share | $ 438.27 | $ 328.59 | $ 444.18 | $ 328.41

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