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Basis of Presentation - VIEs Total Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Total Assets $ 871,161 $ 997,750
Variable Interest Entity, Consolidated, Carrying Amount, Total Liabilities 450,691 532,983
Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Total Assets 1,575 1,543
Variable Interest Entity, Consolidated, Carrying Amount, Total Liabilities $ 259 $ 230