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Investments (Net Realized Losses on Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Gain (Loss) on Securities [Line Items] |  |  |
Decrease (increase) in allowance for credit losses | $ (15,126) | $ 7,005 |
Recovery of specific allowance | 1,677 | 0 |
Net realized losses on investments | (47,848) | (13,242) | $ (80,680)
Fixed Maturity Securities, Available For Sale |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Gross realized gains | 139,819 | 10,167 | 305,170
Gross realized losses | (153,712) | (19,140) | (276,847)
Net credit loss (provision) release | (15,536) | (6,241) | (94,560)
Realized losses | (29,429) | (15,214) | (66,237)
Mortgage Loans on Real Estate |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Decrease (increase) in allowance for credit losses | (15,126) | 7,005 | (15,447)
Recovery of specific allowance | 1,677 | 0 | 712
Gain (loss) on sale of mortgage loans | (4,970) | (5,033) | 292
Gain (loss) on mortgage loans | $ (18,419) | $ 1,972 | $ (14,443)

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