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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share Repurchase Program |  |  |  |
Shares repurchased | 965 | 1,025 | 2,634 | 3,585
Average price per share | $ 458.70 | $ 377.85 | $ 415.28 | $ 364.84
Total investment | $ 442,962 | $ 387,255 | $ 1,093,973 | $ 1,307,947

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