Policyholders' Liabilities (Additional Insurance Reserves) (Details) - Variable/Universal Life - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period	$ 3,741,426	$ 3,067,336
Unearned revenue	430,230	405,732
Amortization Expense	(89,640)	(70,981)
Other adjustments	(1)	(93)
Balance, end of period	4,082,015	3,401,994
Less: Reinsurance recoverables	1,794,071	1,621,229
Unearned revenue reserve net of reinsurance recoverables	$ 2,287,944	$ 1,780,765