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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount | $ 200,000 |  |  |  | $ 200,000
Common stock surrendered as payment | 159,347 | $ 106,036 | $ 317 | $ 102,031 |
Value of common shares remaining to be repurchased | $ 208,498 |  |  |  | $ 208,498
Repurchases in Accordance with Stock Award Agreements [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Acquisition of treasury stock (shares), total |  |  |  |  | 40
Common stock surrendered as payment |  |  |  |  | $ 58,860

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