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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Apr. 21, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchase program, authorized amount | $ 2,900,000 |  |
Common stock surrendered as payment | 106,036 | $ 102,031 |
Value of common shares remaining to be repurchased | $ 153,792 |  |
Repurchases in Accordance with Stock Award Agreements [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Acquisition of treasury stock (shares), total | 31 |  |
Common stock surrendered as payment | $ 44,810 |  |
Subsequent Event [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchase program, authorized amount |  |  | $ 100,000

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