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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 30, 2020
Variable Interest Entity [Line Items]    
Net assets held by SSE holders $ 1,407,589 $ 1,145,348
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Net assets held by SSE holders $ 380,713 $ 383,669