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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, 2024 | Mar. 31, 2023
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Gains (losses) due to changes in fair value of investments | $ 24,944 | $ 43,050
Investments |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Gains (losses) due to changes in fair value of investments | 25,100 | 43,050
Fixed maturity securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Gains (losses) due to changes in fair value of investments | (9,294) | 39,776
Equity securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Gains (losses) due to changes in fair value of investments | 34,498 | 3,240
Short-term investments |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Gains (losses) due to changes in fair value of investments | (104) | 34
Financing Receivable |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Gains (losses) due to changes in fair value of investments | $ (156) | $ 0

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