Investments (Accrued Investment Income) (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Dec. 31, 2024
Net Investment Income
Accrued investment income	[1]	$ 563,184	$ 466,394
Fixed maturities
Net Investment Income
Accrued investment income		492,362	396,173
Equity securities
Net Investment Income
Accrued investment income		512	436
Commercial mortgage and other loans
Net Investment Income
Accrued investment income		40,508	29,437
Policy loans
Net Investment Income
Accrued investment income		22,388	30,820
Short-term investments and cash equivalents
Net Investment Income
Accrued investment income		$ 7,414	$ 9,528

[1] See Note 4 for details of balances associated with variable interest entities.