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INSURANCE INTANGIBLES, UNEARNED REVENUE RESERVES AND UNEARNED FRONT-END LOADS - Value of Business Acquired Liability (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Movement In Value Of Business Acquired Liability [Roll Forward]  
Balance, as of Acquisition Date $ 1,273,414
Amortized to expense during period (118,291)
Balance, as of end of period $ 1,155,123