Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Insurance reserves	$ 241,627	$ 2,648,343
Investments	830,326	425,467
Other	563	539
Deferred tax assets	1,072,516	3,074,349
Deferred tax liabilities:
VOBA and deferred policy acquisition cost	109,877	879,072
Deferred sales inducements	61,970	150,065
Net unrealized gain on securities	55,683	506,543
Deferred tax liabilities	227,530	1,535,680
Deferred Tax Assets, Net	$ 844,986	$ 1,538,669