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INSURANCE INTANGIBLES, UNEARNED REVENUE RESERVES AND UNEARNED FRONT-END LOADS - Value of Business Acquired Liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Movement In Value Of Business Acquired Liability [Roll Forward]    
Balance, as of beginning of period $ 1,118,716 $ 1,273,414
Amortized to expense during period (139,035) (154,698)
Balance, as of end of period $ 979,681 $ 1,118,716