Investments - Schedule of Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Net Investment Income [Line Items]
Gross investment income	$ 13,867	$ 10,768	$ 27,017	$ 20,199
Management fee (reversal)	1,058	(1,286)	2,038	115
Other expenses	(147)	(163)	(275)	(298)
Net investment income	12,662	11,891	24,704	19,786
Fixed-maturity securities, available-for-sale
Net Investment Income [Line Items]
Gross investment income	8,936	6,524	17,379	12,840
Utility & Infrastructure Investments
Net Investment Income [Line Items]
Gross investment income	1,178	1,072	2,312	2,931
Short-term investments
Net Investment Income [Line Items]
Gross investment income	1,939	1,154	3,568	1,724
Loans to affiliates
Net Investment Income [Line Items]
Gross investment income	1,524	1,543	3,053	1,793
Cash equivalents
Net Investment Income [Line Items]
Gross investment income	$ 290	$ 475	$ 705	$ 911

Amount, after 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.

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