Investments (Accrued Investment Income) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Net Investment Income
Accrued investment income	$ 577,220	$ 466,394
Fixed maturities
Net Investment Income
Accrued investment income	484,760	396,173
Equity securities
Net Investment Income
Accrued investment income	218	436
Commercial mortgage and other loans
Net Investment Income
Accrued investment income	32,984	29,437
Policy loans
Net Investment Income
Accrued investment income	52,915	30,820
Short-term investments and cash equivalents
Net Investment Income
Accrued investment income	$ 6,343	$ 9,528