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Investments (Net Realized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Increase in allowance for credit losses | $ (4,687) | $ (4,716) |  | $ (8,110) | $ (13,309) |
Net realized losses on investments | (44,672) | (15,860) | [1] | (97,138) | (62,259) | [1]
Fixed Maturity Securities, Available For Sale |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Gross realized gains | 52,700 | 23,978 |  | 137,744 | 27,950 |
Gross realized losses | (91,184) | (33,881) |  | (171,970) | (59,940) |
Net credit loss (provision) release | 537 | (1,487) |  | (46,565) | (14,341) |
Realized gains (losses) | (37,947) | (11,390) |  | (80,791) | (46,331) |
Other Investments |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Gross realized gains | 29 | 0 |  | 2,239 | 0 |
Gross realized losses | 0 | 0 |  | (5,061) | 0 |
Other investments, realized gains (losses) | 29 | 0 |  | (2,822) | 0 |
Mortgage Loans on Real Estate |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Increase in allowance for credit losses | (4,687) | (4,716) |  | (8,110) | (13,309) |
Recovery of specific allowance | 0 | 1,086 |  | 0 | 1,315 |
Loss on sale of mortgage loans | (2,067) | (840) |  | (5,415) | (3,934) |
Gain (loss) on mortgage loans | $ (6,754) | $ (4,470) |  | $ (13,525) | $ (15,928) |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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