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Revenue - Management Fee Revenue (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]    
Amounts due from related parties $ 6,493 $ 1,743
Amounts due to related parties 3,926 11,790
Related Parties | Management and administrative services revenue    
Related Party Transaction [Line Items]    
Amounts due from related parties 1,300 1,400
Amounts due to related parties $ 100 $ 200