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Share Repurchase Program (Schedule Of Shares Repurchased) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Proceeds from (Repurchase of) Equity [Abstract] |  |  |  |
Shares repurchased | 1,025 | 932 | 3,585 | 4,695
Average price per share | $ 377.85 | $ 306.22 | $ 364.84 | $ 266.48
Total investment | $ 387,255 | $ 285,183 | $ 1,307,947 | $ 1,251,013

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