Policyholders' Account Balances (Additional Insurance Reserves) (Details) - Variable/Universal Life - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 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	636,336	644,001
Amortization Expense	(150,980)	(136,630)
Other adjustments	25	(2)
Balance, end of period	$ 4,900,569	$ 4,248,795