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Basis of Presentation - VIEs Total Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Variable Interest Entity, Consolidated, Carrying Amount, Total Assets $ 11,331 $ 12,203
Variable Interest Entity, Consolidated, Carrying Amount, Total Liabilities 15,556 11,573
Variable Interest Entity, Non-consolidated, Carrying Amount, Total Assets 448 447
Variable Interest Entity, Non-consolidated, Carrying Amount, Total Liabilities $ 372 $ 362