Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Insurance reserves	$ 1,716,039	$ 1,521,729
Investments	411,788	276,880
Deferred Tax Assets, Unrealized Losses on Trading Securities	0	86,742
Other	2,002	638
Deferred tax assets	2,129,829	1,885,989
Deferred tax liabilities:
DeferredTaxLiabilitiesVOBAandDAC	929,882	929,849
Deferred sales inducements	170,672	186,816
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	154,815	0
Deferred tax liabilities	1,255,369	1,116,665
Deferred Tax Assets, Net	$ 874,460	$ 769,324