Liability For Future Policy Benefits (Future Policy Benefits) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Insurance [Abstract]
Benefit reserves, end of period, post-flooring	$ 7,666,556		$ 7,569,229
Deferred profit liability, end of period, post-flooring	23,391		15,038
Additional insurance reserves, including amounts in AOCI, end of period, post-flooring	16,798,040		14,646,054
Subtotal of amounts disclosed above	24,487,987		22,230,321
Other Future Policy Benefits reserves	1,055,140		1,181,796
Total Future policy Benefits	$ 25,543,127	$ 25,113,767	$ 23,412,117