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Investments - Net Investment Income (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] |  |  |  |  |
Gross investment income, operating |  | $ 58,943 | $ 59,123 | $ 175,019 | $ 171,033
Investment expenses |  | (2,036) | (2,106) | (6,223) | (6,314)
Investment income net of investment expenses |  | 56,907 | 57,017 | 168,796 | 164,719
Interest expense on surplus note |  | (14,476) | (15,908) | (43,766) | (47,352)
Net investment income |  | 42,431 | 41,109 | 125,030 | 117,367
Equity Securities [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Gross investment income, operating |  | 318 | 324 | 947 | 1,036
Policy Loans and Other Invested Assets [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Gross investment income, operating |  | 611 | 402 | 2,125 | 1,407
Cash, Cash Equivalents and Short-Term Investments [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Gross investment income, operating |  | 6,340 | 6,540 | 18,818 | 20,161
Total return on deposit asset underlying 10% insurance agreement [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Gross investment income, operating | [1] | 1,980 | 3,959 | 6,286 | 8,534
Available-for-Sale [Member] | Fixed Maturities |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Gross investment income, operating |  | 35,218 | 31,990 | 103,077 | 92,543
Held-to-Maturity [Member] | Fixed Maturities |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Gross investment income, operating |  | $ 14,476 | $ 15,908 | $ 43,766 | $ 47,352
[1] | I ncludes $0.3 million and $1.0 million of net gains (losses) recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement for the three and nine months ended September 30, 2025, respectively. Includes $1.8 million and $1.9 million of net gains (losses) recognized for the change in fair value of the deposit asset underlying the 10% coinsurance agreement for the three and nine months end ed September 30, 2024, respectively.

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- Definition Amount, before investment expense, of income earned or loss recognized from investments in securities. Includes, but is not limited to, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References No definition available. + Details
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