Policyholders' Liabilities (Additional Insurance Reserves) (Details) - Variable/Universal Life - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period	$ 4,415,188	$ 3,741,426
Unearned revenue	211,830	211,542
Amortization Expense	(50,952)	(44,470)
Other adjustments	0	(1)
Balance, end of period	$ 4,576,066	$ 3,908,497