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POLICY LIABILITIES - Reserves Reported for Contractholder Deposit Funds (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Guaranteed Minimum Death Benefit    
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]    
Balance, as of beginning of year $ 119,705 $ 110,243
Expense incurred 71,687 28,352
Claims paid (27,832) (15,011)
Reinsurance premium paid (18,101) (13,267)
Claims ceded to reinsurers 15,549 9,388
Balance, as of end of year 161,008 119,705
Guaranteed Minimum Withdrawal Benefit    
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]    
Balance, as of beginning of year 1,010,846 872,914
Expense incurred 171,603 137,932
Balance, as of end of year $ 1,182,449 $ 1,010,846