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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Gain (Loss) on Securities [Line Items] |  |  |  |
Decrease (increase) in allowance for credit losses | $ 1,933 | $ (2,510) | $ 4,448 | $ (4,507)
Recovery of specific allowance | 0 | 712 | 0 | 712
Net realized losses on investments | (3,114) | (25,888) | (7,697) | (46,224)
Available For Sale Fixed Maturity Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross realized gains | 4,062 | 1,215 | 6,429 | 15,453
Gross realized losses | (7,951) | (264) | (16,147) | (1,470)
Net credit loss (provision) release | 1,260 | (25,041) | (177) | (56,412)
Realized gains (losses) | (2,629) | (24,090) | (9,895) | (42,429)
Mortgage Loans on Real Estate |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Decrease (increase) in allowance for credit losses | 1,933 | (2,510) | 4,448 | (4,507)
Recovery of specific allowance | 0 | 712 | 0 | 712
Loss on sale of mortgage loans | (2,418) | 0 | (2,250) | 0
Gain (loss) on mortgage loans | $ (485) | $ (1,798) | $ 2,198 | $ (3,795)

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