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INSURANCE INTANGIBLES, UNEARNED REVENUE RESERVES AND UNEARNED FRONT-END LOADS - Value of Business Acquired Asset (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Movement in Present Value of Future Insurance Profits [Roll Forward]    
Balance, as of beginning of period $ 959,263 $ 1,024,520
Amortized to expense during period (65,580) (65,257)
Balance, as of end of period $ 893,683 $ 959,263