Deferred Policy Acquisition Costs, Deferred Reinsurance Losses, Deferred Reinsurance Gains And Deferred Sales Inducements (Balance of and Changes in DAC) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	$ 7,097,511	$ 6,930,425
Capitalization	331,766	246,738
Amortization expense	(145,806)	(137,546)
Other	(38,017)	52
Balance, end of period	7,245,454	7,039,669
Fixed Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	197,937	102,250
Capitalization	64,744	22,902
Amortization expense	(8,725)	(4,474)
Other	0	0
Balance, end of period	253,956	120,678
Variable Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	3,257,761	3,736,456
Capitalization	78,335	56,875
Amortization expense	(84,320)	(87,864)
Other	0	0
Balance, end of period	3,251,776	3,705,467
Term Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	743,888	648,836
Capitalization	43,874	33,006
Amortization expense	(18,180)	(15,304)
Other	0	0
Balance, end of period	769,582	666,538
Variable/Universal Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	2,897,925	2,442,883
Capitalization	144,813	133,955
Amortization expense	(34,581)	(29,904)
Other	(38,017)	52
Balance, end of period	$ 2,970,140	$ 2,546,986