Investments - Schedule of Analysis of Investment Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net Investment Income [Line Items]
Investment income, gross	$ 1,157,550	$ 1,154,858	$ 1,074,157
Less investment expense	(27,352)	(19,227)	(17,273)
Net investment income	1,130,198	1,135,631	1,056,884
Fixed maturities available for sale
Net Investment Income [Line Items]
Investment income, gross	974,111	981,439	944,628
Policy loans
Net Investment Income [Line Items]
Investment income, gross	55,876	52,625	49,011
Mortgage loans
Net Investment Income [Line Items]
Investment income, gross	28,064	27,809	19,541
Other long-term investments
Net Investment Income [Line Items]
Investment income, gross	90,321	81,834	54,655
Short-term investments
Net Investment Income [Line Items]
Investment income, gross	9,178	11,151	6,322
Fair value option
Net Investment Income [Line Items]
Net investment income	$ 76,200	$ 74,800	$ 52,300

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.

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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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