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REVENUE - Management Fee Revenue (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]    
Amounts due from related parties $ 1,743 $ 9,425
Amounts due to related parties 11,790 5,417
Related Parties | Management and administrative services revenue    
Related Party Transaction [Line Items]    
Amounts due from related parties 1,400 3,100
Amounts due to related parties $ 200 $ 4,300