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Investments - Schedule of Analysis of Investment Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net Investment Income [Line Items] |  |  |  |
Investment income, gross | $ 292,555 | $ 289,352 | $ 868,548 | $ 866,163
Less investment expense | (6,542) | (4,388) | (19,752) | (12,985)
Net investment income | $ 286,013 | 284,964 | $ 848,796 | 853,178
Percentage change in investment income, gross | 1.00% |  | 0.00% |
Percentage change in investment expense | 49.00% |  | 52.00% |
Percentage change in net investment income | 0.00% |  | (1.00%) |
Fixed maturities available for sale |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, gross | $ 243,444 | 245,313 | $ 730,859 | 738,626
Percentage change in investment income, gross | (1.00%) |  | (1.00%) |
Policy loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, gross | $ 14,123 | 13,296 | $ 41,631 | 39,196
Percentage change in investment income, gross | 6.00% |  | 6.00% |
Mortgage loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, gross | $ 7,960 | 7,668 | $ 19,978 | 21,337
Percentage change in investment income, gross | 4.00% |  | (6.00%) |
Other long-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, gross | $ 24,417 | 19,992 | $ 68,934 | 58,608
Percentage change in investment income, gross | 22.00% |  | 18.00% |
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income, gross | $ 2,611 | 3,083 | $ 7,146 | 8,396
Percentage change in investment income, gross |  |  |  |
Fair value option |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net investment income | $ 21,600 | $ 19,100 | $ 58,900 | $ 56,100

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479168/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 + Details
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