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Share Repurchase Program (Schedule Of Shares Repurchased) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Proceeds from (Repurchase of) Equity [Abstract] |  |
Shares repurchased | 6,061 | 9,301
Average price per share | $ 282.80 | $ 233.57
Total investment | $ 1,713,953 | $ 2,172,437

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