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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Gain (Loss) on Securities [Line Items] |  |  |  |
Decrease (increase) in allowance for credit losses | $ 5,023 | $ 810 | $ 9,471 | $ (3,697)
Recovery of specific allowance | 0 | 0 | 0 | 712
Net realized gains (losses) on investments | 4,933 | (22,321) | (2,764) | (68,545)
Available For Sale Fixed Maturity Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 1,001 | 2,843 | 7,430 | 18,296
Gross realized losses | 0 | (51) | (16,147) | (1,521)
Net credit loss (provision) release | 84 | (25,923) | (93) | (82,335)
Realized gains (losses) | 1,085 | (23,131) | (8,810) | (65,560)
Mortgage Loans on Real Estate |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Decrease (increase) in allowance for credit losses | 5,023 | 810 | 9,471 | (3,697)
Recovery of specific allowance | 0 | 0 | 0 | 712
Loss on sale of mortgage loans | (1,175) | 0 | (3,425) | 0
Gain (loss) on mortgage loans | $ 3,848 | $ 810 | $ 6,046 | $ (2,985)

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