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Related Party Transactions - Non-interest Bearing Advances - Additional Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]    
Advances to affiliates $ 6,940 $ 4,924
Advances from affiliates 8,086 11,047
Affiliated Entity [Member]    
Related Party Transaction [Line Items]    
Advances to affiliates 6,900 4,900
Advances from affiliates $ 8,100 $ 11,000