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Fair Value Option (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | $ 44,795 | $ 166,829 | $ 71,314 | $ (74,161)
Investments [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | 44,810 | 166,830 | 71,342 | (74,193)
Fixed maturity securities [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | 12,448 | 50,251 | 4,391 | 238
Equity Securities [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | 32,421 | 111,940 | 66,942 | (74,433)
Short-term investments [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | (59) | 4,639 | 9 | 2
Financing Receivable [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | $ (15) | $ (1) | $ (28) | $ 32

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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