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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
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Mar. 31, 2023 | Mar. 31, 2022
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
(Losses) gains due to changes in fair value of investments | $ 43,050 | $ (198,248)
Fixed maturity securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
(Losses) gains due to changes in fair value of investments | 39,776 | (157,929)
Equity Securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
(Losses) gains due to changes in fair value of investments | 3,240 | (40,321)
Short-term investments |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
(Losses) gains due to changes in fair value of investments | $ 34 | $ 2

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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 https://asc.fasb.org/extlink&oid=123596393&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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