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Investments (Net Realized Losses on Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Decrease (increase) in allowance for credit losses | $ (1,174) | $ (15,126) |  |  |
Net realized gains (losses) on investments | (99,203) | (47,848) | [1] | $ (13,242) | [1]
Fixed Maturity Securities, Available For Sale |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Gross realized gains | 137,901 | 139,819 |  | 10,167 |
Gross realized losses | (179,479) | (153,712) |  | (19,140) |
Net credit loss (provision) | (47,471) | (15,536) |  | (6,241) |
Realized gains (losses) | (89,049) | (29,429) |  | (15,214) |
Other investments |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Gross realized gains | 2,210 | 0 |  | 0 |
Gross realized losses | (5,199) | 0 |  | 0 |
Realized gains (losses) | (2,989) | 0 |  | 0 |
Mortgage loans on real estate |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Decrease (increase) in allowance for credit losses | 252 | (15,126) |  | 7,005 |
Recovery of specific allowance | 0 | 1,677 |  | 0 |
Loss on sale of mortgage loans | (7,417) | (4,970) |  | (5,033) |
Gain (loss) on mortgage loans | $ (7,165) | $ (18,419) |  | $ 1,972 |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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