Liability For Future Policy Benefits (Deferred Profit Liability) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022		Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Other adjustments	$ (6,565)	$ 2,935	[1]	$ (1,030)	$ (42,865)	[1]
Balance, end of period	20,152,378	18,967,414		20,152,378	18,967,414
Deferred profit liability
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue				3,325
Deferred Profit Liability Netting
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue					(2,002)
Fixed Annuities
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Effect of actual variances from expected experience and other activity							$ 6,793	$ (1,489)
Adjusted balance, beginning of period							236,396	218,872
Interest accrual				6,300	5,798
Other adjustments				(84)	(285)
Balance, end of period	211,670	199,103		211,670	199,103
Reinsurance recoverable	17,097	16,408		17,097	16,408
Balance after reinsurance recoverable, end of period, post-flooring	194,573	182,695		194,573	182,695
Fixed Annuities | Gross Basis
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue				32,677	25,058
Fixed Annuities | Deferred profit liability
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period				18,193	15,765
Effect of actual variances from expected experience and other activity							(6,924)	834
Adjusted balance, beginning of period							$ 11,269	$ 16,599
Profits deferred				4,834	2,173
Interest accrual				423	444
Amortization				(1,647)	(1,424)
Other adjustments				(11)	(25)
Balance, end of period	14,868	17,767		14,868	17,767
Reinsurance recoverable	1,435	1,710		1,435	1,710
Balance after reinsurance recoverable, end of period, post-flooring	$ 13,433	$ 16,057		13,433	16,057
Revenue				3,325
Fixed Annuities | Deferred profit liability | Gross Basis
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Interest accrual				423	444
Fixed Annuities | Deferred Profit Liability Netting
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue					(2,002)
Fixed Annuities | Deferred Profit Liability Netting | Gross Basis
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue				$ 3,325	$ (2,002)

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