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Receivables and Payables - Brokers, Dealers, and Clearing Organizations (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Receivables from brokers, dealers and clearing organizations    
Broker-dealers $ 189,817 $ 147,116
Clearing organizations 708 5,117
Securities borrowed 4,246 374
Allowance for doubtful accounts (864) (313)
Total 193,907 152,294
Payables to brokers, dealers and clearing organizations    
Broker-dealers 105,022 56,894
Clearing organizations 10,011 8,096
Securities loaned 4,245 35,198
Total $ 119,278 $ 100,188