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Shareholders' Equity (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended | 156 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, authorized amount | $ 115,018 |  |  | $ 115,018
Common stock surrendered as payment | 102,956 | $ 198,563 | $ 166,147 | $ 2,800,000
Repurchases in Accordance with Stock Award Agreements [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock surrendered as payment | $ 48,555 | $ 10,420 | $ 5,411 |

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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