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Capital Stock Repurchase Plan Transactions (Schedule Of Capital Stock Repurchases) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Capital Stock Repurchase Plan Transactions [Abstract] |  |  |  |
Total cost of repurchased shares | $ 22,676 | $ 3,179 | $ 71,926 | $ 84,304
Shares repurchased | 69,009 | 10,000 | 219,009 | 310,000
Weighted average price per share | $ 328.59 | $ 317.86 | $ 328.41 | $ 271.95

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