Policyholders' Liabilities (Additional Insurance Reserves) (Details) - Variable/Universal Life - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 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	644,001	612,196
Amortization Expense	(136,630)	(111,353)
Other adjustments	(2)	(95)
Balance, end of period	4,248,795	3,568,084
Less: Reinsurance recoverables	1,822,597	1,656,299
Unearned revenue reserve net of reinsurance recoverables	$ 2,426,198	$ 1,911,785