Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Insurance reserves	$ 1,660,421	$ 1,235,687
Deferred Tax Assets, Investments	776,190	354,538
Net unrealized loss on securities	296,749	481,989
Other	4,723	2,801
Deferred tax assets	2,738,083	2,075,015
Deferred tax liabilities:
Deferred policy acquisition cost	936,929	954,953
Deferred sales inducements	72,791	80,116
Deferred tax liabilities	1,009,720	1,035,069
Net deferred tax asset	$ 1,728,363	$ 1,039,946