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Investments (Components of Net Investment Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net Investment Income [Line Items] |  |  |  |  |
Investment income, gross | $ 2,415,942 | $ 2,453,929 |  | $ 2,101,892 |
Less: investment expenses | (143,144) | (146,466) |  | (64,417) |
Net investment income | 2,272,798 | 2,307,463 | [1] | 2,037,475 | [1]
Fixed Maturity Securities, Available For Sale |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment income, gross | 1,653,897 | 1,849,915 |  | 1,772,675 |
Real estate investments |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment income, gross | (7,303) | 40,243 |  | 14,138 |
Mortgage loans on real estate |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment income, gross | 404,303 | 301,118 |  | 215,138 |
Cash and Cash Equivalents |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment income, gross | 208,923 | 24,985 |  | 3,385 |
Limited partnerships and limited liability companies |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment income, gross | 112,612 | 188,131 |  | 67,157 |
Other investments |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment income, gross | $ 43,510 | $ 49,537 |  | $ 29,399 |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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