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REVENUE - Management Fee Revenue (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]    
Amounts due from related parties $ 3,484 $ 2,112
Amounts due to related parties $ 0 12,006
Related parties | Management and administrative services revenue    
Related Party Transaction [Line Items]    
Amounts due from related parties   1,000
Amounts due to related parties   $ 600