Deferred Policy Acquisition Costs, Deferred Reinsurance Losses, Deferred Reinsurance Gains And Deferred Sales Inducements (Balance of and Changes in DAC) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	$ 7,097,511	$ 6,930,425
Capitalization	1,069,742	785,410
Amortization expense	(442,739)	(398,884)
Other	(18,436)	(393,397)
Balance, end of period	7,706,078	6,923,554
Fixed Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	197,937	102,251
Capitalization	174,397	77,409
Amortization expense	(29,806)	(15,270)
Other	0	0
Balance, end of period	342,528	164,390
Variable Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	3,257,761	3,736,454
Capitalization	272,819	180,239
Amortization expense	(256,552)	(245,590)
Other	0	(393,385)
Balance, end of period	3,274,028	3,277,718
Term Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred Policy Acquisition Cost, Beginning Balance	743,888	648,837
Capitalization	138,395	114,860
Amortization expense	(52,564)	(47,256)
Other	(97)	0
Balance, end of period	829,622	716,441
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	484,131	412,902
Amortization expense	(103,817)	(90,768)
Other	(18,339)	(12)
Balance, end of period	$ 3,259,900	$ 2,765,005