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Investments (Net Realized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Gain (Loss) on Securities [Line Items] |  |
Increase in allowance for credit losses | $ (4,091) | $ (8,654)
Net realized losses on investments | (94,050) | (27,787)
Fixed Maturity Securities, Available For Sale |  |
Gain (Loss) on Securities [Line Items] |  |
Gross realized gains | 15,887 | 25,988
Gross realized losses | (104,505) | (44,451)
Net credit loss recovery (provision) | 512 | (829)
Realized gains (losses) | (88,106) | (19,292)
Other Investments |  |
Gain (Loss) on Securities [Line Items] |  |
Gross realized gains | 0 | 1,777
Gross realized losses | 0 | (432)
Realized gains (losses) | 0 | 1,345
Mortgage Loans on Real Estate |  |
Gain (Loss) on Securities [Line Items] |  |
Increase in allowance for credit losses | (3,468) | (8,654)
Recovery of specific allowance | 0 | 0
Loss on sale of mortgage loans | (2,476) | (1,186)
Gain (loss) on mortgage loans | $ (5,944) | $ (9,840)

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