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Shareholders' Equity (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 2,800,000 |  |  |  |  |  | $ 2,800,000
Common stock surrendered as payment | 29 | $ 317 | $ 102,031 | $ 38,950 | $ 58,512 | $ 62,854 |
Value of common shares remaining to be repurchased | $ 115,018 |  |  |  |  |  | $ 115,018
Repurchases in Accordance with Stock Award Agreements [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Acquisition of treasury stock (shares), total | 0 |  |  |  |  |  | 58,000
Common stock surrendered as payment |  |  |  |  |  |  | $ 47,976

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