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Revenue - Management Fee Revenue (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]    
Amounts due from related parties $ 1,473 $ 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 100 1,000
Amounts due to related parties $ 0 $ 600