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Related Party Transactions - Non-interest Bearing Advances - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]    
Advances to affiliates $ 14,664 $ 4,924
Advances from affiliates 13,802 11,047
Affiliated Entity [Member]    
Related Party Transaction [Line Items]    
Advances to affiliates 14,700 4,900
Advances from affiliates $ 13,800 $ 11,000