Investments (Accrued Investment Income) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Net Investment Income
Accrued investment income	$ 191,602	$ 160,027
Fixed maturities
Net Investment Income
Accrued investment income	160,791	117,216
Equity securities
Net Investment Income
Accrued investment income	381	2
Commercial mortgage and other loans
Net Investment Income
Accrued investment income	12,351	7,025
Policy loans
Net Investment Income
Accrued investment income	15,178	35,153
Other invested assets
Net Investment Income
Accrued investment income	47	254
Short-term investments and cash equivalents
Net Investment Income
Accrued investment income	$ 2,854	$ 377