Deferred Policy Acquisition Costs, Deferred Reinsurance Losses, Deferred Reinsurance Gains And Deferred Sales Inducements (Balance of and Changes in DSI) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Movement in Deferred Sales Inducements [Roll Forward]
Balance, beginning of period	[1]	$ 381,504
Balance, end of period	[1]	374,826
Variable Annuities
Movement in Deferred Sales Inducements [Roll Forward]
Balance, beginning of period		381,504	$ 414,619
Capitalization		1,540	857
Amortization expense		(8,218)	(8,658)
Balance, end of period		$ 374,826	$ 406,818

[1] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.