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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 | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
Losses due to changes in fair value of investments | $ (100,281) | $ (127,219) | $ (92,593) | $ (549,775)
Investments |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
Losses due to changes in fair value of investments | (100,244) | (127,219) | (92,681) | (549,775)
Fixed maturity securities |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
Losses due to changes in fair value of investments | (70,855) | (83,257) | (53,915) | (329,458)
Equity Securities |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
Losses due to changes in fair value of investments | (29,452) | (45,779) | (38,820) | (220,469)
Short-term investments |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
Losses due to changes in fair value of investments | 63 | 1,817 | 54 | 152
Financing Receivable |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
Losses due to changes in fair value of investments | $ (37) | $ 0 | $ 88 | $ 0

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