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Share Repurchase Program (Schedule Of Shares Repurchased) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Proceeds from (Repurchase of) Equity [Abstract] |  |
Shares repurchased | 927 | 2,188
Average price per share | $ 347.09 | $ 251.08
Total investment | $ 321,846 | $ 549,428

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