Policyholders' Account Balances (Additional Insurance Reserves) (Details) - Variable/Universal Life - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period	$ 4,415,188	$ 3,741,426
Unearned revenue	425,385	430,230
Amortization Expense	(100,005)	(89,640)
Other adjustments	(1)	(1)
Balance, end of period	$ 4,740,567	$ 4,082,015