Separate Accounts - Schedule of Balances of and Changes in Separate Account Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Separate Accounts Disclosure [Abstract]
Separate Account, Liability, Beginning Balance	$ 2,305,717	$ 2,799,992
Premiums and deposits	151,124	253,982
Surrenders and withdrawals	(261,420)	(293,278)
Investment Performance	28,654	(202,997)
Management fees and other charges	(45,671)	(62,281)
Foreign exchange translation	5,031	(189,701)
Separate Account, Liability, Ending Balance	2,183,435	2,305,717
Cash surrender value	$ 2,150,300	$ 2,268,436