Investments (Accrued Investment Income) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Net Investment Income
Accrued investment income	$ 466,394	$ 333,838
Fixed maturities
Net Investment Income
Accrued investment income	396,173	272,031
Equity securities
Net Investment Income
Accrued investment income	436	220
Commercial mortgage and other loans
Net Investment Income
Accrued investment income	29,437	21,070
Policy loans
Net Investment Income
Accrued investment income	30,820	35,210
Other invested assets
Net Investment Income
Accrued investment income	0	43
Short-term investments and cash equivalents
Net Investment Income
Accrued investment income	$ 9,528	$ 5,264