Liability For Future Policy Benefits (Future Policy Benefits) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Insurance [Abstract]
Benefit reserves, end of period, post-flooring	$ 7,449,542		$ 7,365,740
Deferred profit liability, end of period, post-flooring	20,007		14,502
Additional insurance reserves, including amounts in AOCI, end of period, post-flooring	14,474,129		13,488,863
Subtotal of amounts disclosed above	21,943,678		20,869,105
Other Future Policy Benefits reserves	1,086,901		1,108,889
Total Future policy Benefits	$ 23,030,579	$ 23,205,205	$ 21,977,994