Deferred Policy Acquisition Costs, Deferred Reinsurance Losses, Deferred Reinsurance Gains And Deferred Sales Inducements (Balance of and Changes in Deferred Reinsurance Gain) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Reinsurance Recoverable, Allowance for Credit Gain [Roll Forward]
Balance, beginning of period	$ 1,673,290	$ 1,492,856
Amortization	(74,253)	(45,647)
Other	1,092,151	277,262
Balance, end of period	2,691,188	1,724,471
Fixed Annuities
Reinsurance Recoverable, Allowance for Credit Gain [Roll Forward]
Balance, beginning of period	48,073	57,898
Amortization	(5,444)	(4,406)
Other	(8)	0
Balance, end of period	42,621	53,492
Variable Annuities
Reinsurance Recoverable, Allowance for Credit Gain [Roll Forward]
Balance, beginning of period	261,721	0
Amortization	(10,119)	(5,209)
Other	(40)	(277,262)
Balance, end of period	251,562	272,053
Variable/Universal Life
Reinsurance Recoverable, Allowance for Credit Gain [Roll Forward]
Balance, beginning of period	1,363,496	1,434,958
Amortization	(58,690)	(36,032)
Other	1,092,199	0
Balance, end of period	2,397,005	$ 1,398,926
Variable/Universal Life | Somerset Re
Reinsurance Recoverable, Allowance for Credit Gain [Roll Forward]
Other	1,207,000
Variable/Universal Life | PURC
Reinsurance Recoverable, Allowance for Credit Gain [Roll Forward]
Other	$ 116,000