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Related Parties Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Other Assets [Member]          
Related Party Transaction [Line Items]          
Due from Related Parties, Noncurrent $ 6,730   $ 6,730   $ 10,159
Investment Banking [Member] | Director [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties $ 2,635 $ 4,859 $ 26,050 $ 13,628