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Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 118 Months Ended
--- | --- | --- | --- | ---
Nov. 06, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Nov. 06, 2020
Subsequent Event [Line Items] |  |  |  |  |  |
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 |
Subsequent event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Shares repurchased | 1,000 |  |  |  |  | 79,800
Average price per share | $ 454.15 |  |  |  |  | $ 172.09
Total investment | $ 465,300 |  |  |  |  | $ 13,700,000

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