Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Insurance reserves	$ 1,749,792	$ 1,663,037
Deferred Tax Assets, Investments	1,033,856	788,425
Net unrealized loss on securities	410,718	296,749
Other	5,647	4,723
Deferred tax assets	3,200,013	2,752,934
Deferred tax liabilities:
Deferred policy acquisition cost	1,227,858	946,846
Deferred sales inducements	66,686	72,791
Deferred tax liabilities	1,294,544	1,019,637
Net deferred tax asset	$ 1,905,469	$ 1,733,297