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REVENUE - Management Fee Revenue (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]    
Amounts due from related parties $ 2,112 $ 1,743
Amounts due to related parties 12,006 11,790
Related Parties | Management and administrative services revenue    
Related Party Transaction [Line Items]    
Amounts due from related parties 1,000 1,400
Amounts due to related parties $ 600 $ 200