Liability For Future Policy Benefits (Future Policy Benefits) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Insurance [Abstract]
Benefit reserves, end of period, post-flooring	$ 7,884,537		$ 7,968,126
Deferred profit liability, end of period, post-flooring	23,010		19,979
Additional insurance reserves, including amounts in AOCI, end of period, post-flooring	17,782,283		16,232,777
Subtotal of amounts disclosed above	25,689,830		24,220,882
Other Future Policy Benefits reserves	1,107,667		1,032,177
Total Future policy Benefits	$ 26,797,497	$ 25,113,767	$ 25,253,059