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Financial Instruments Owned (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Financial Instruments Owned at Fair Value [Member]        
Debt and Equity Securities, FV-NI [Line Items]        
Net trading losses $ 1,958 $ 6,010 $ 648 $ 13,922