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Investments (Net Realized Gains (Losses) on Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Decrease (increase) in allowance for credit losses | $ 5,231 | $ (3,348) |  | $ (3,423) | $ (8,593) |
Net realized losses on investments | (24,679) | (33,272) | [1] | (52,466) | (46,399) | [2]
Fixed Maturity Securities, Available For Sale |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Gross realized gains | 59,056 | 507 |  | 85,044 | 3,972 |
Gross realized losses | (36,335) | (24,053) |  | (80,786) | (26,059) |
Net credit loss (provision) release | (46,273) | (5,498) |  | (47,102) | (12,854) |
Realized gains (losses) | (23,552) | (29,044) |  | (42,844) | (34,941) |
Other Investments |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Gross realized gains | 433 | 0 |  | 2,210 | 0 |
Gross realized losses | (4,629) | 0 |  | (5,061) | 0 |
Other investments, realized gains (losses) | (4,196) | 0 |  | (2,851) | 0 |
Mortgage Loans on Real Estate |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Decrease (increase) in allowance for credit losses | 5,231 | (3,348) |  | (3,423) | (8,593) |
Recovery of specific allowance | 0 | 229 |  | 0 | 229 |
Loss on sale of mortgage loans | (2,162) | (1,109) |  | (3,348) | (3,094) |
Gain (loss) on mortgage loans | $ 3,069 | $ (4,228) |  | $ (6,771) | $ (11,458) |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.
[2] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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