Business and Basis of Presentation (Transition Adjustment Roll Forward Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands			12 Months Ended
		Jan. 01, 2021	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Accumulated Other Comprehensive Income Transition Adjustment [Roll Forward]
Beginning balance	[1]		$ (10,065)
Ending balance			(30,920)	$ (10,065)	[1]
Accumulated Other   Comprehensive  Income (Loss)
Accumulated Other Comprehensive Income Transition Adjustment [Roll Forward]
Beginning balance		$ 546,128	(10,065)	396,454		$ 546,128
Ending balance		880,548	(30,920)	(10,065)		396,454
As Originally Reported
Accumulated Other Comprehensive Income Transition Adjustment [Roll Forward]
Beginning balance			(1,581,300)
Ending balance				(1,581,300)
As Originally Reported | Accumulated Other   Comprehensive  Income (Loss)
Accumulated Other Comprehensive Income Transition Adjustment [Roll Forward]
Beginning balance		546,128				$ 546,128
Effect of Change
Accumulated Other Comprehensive Income Transition Adjustment [Roll Forward]
Beginning balance			$ 1,571,235
Ending balance				$ 1,571,235
Effect of Change | Accumulated Other   Comprehensive  Income (Loss)
Accumulated Other Comprehensive Income Transition Adjustment [Roll Forward]
Interest rate remeasurement of future policy benefits		(196,526)
Reclassification of market risk benefits non-performance risk to accumulated other comprehensive income		722,837
Unwinding amounts related to unrealized investment gains and losses		(102,042)
Change in operating joint ventures		(753)
Total pre-tax adjustments		423,516
Tax impacts		$ (89,096)

[1] Prior period amounts reflect the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.