Liability for Future Policy Benefits (Future Policy Benefits Reconciliation) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Insurance [Abstract]
Benefit reserves, end of period, post-flooring	$ 7,512,826	$ 7,727,206	$ 7,128,184
Deferred profit liability, end of period, post-flooring	22,939	14,818	18,193
Additional insurance reserves, including amounts in AOCI, end of period, post-flooring	16,351,052	14,280,792	12,664,445
Subtotal of amounts disclosed above	23,886,817	22,022,816	19,810,822
Other future policy benefit reserves	1,226,950	1,182,389	1,018,211
Future policy benefits	$ 25,113,767	$ 23,205,205	$ 20,829,033