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Receivables from/Payables to Broker-Dealers and Clearing Organizations (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets    
Due from prime brokers $ 518,762 $ 302,152
Deposits with clearing organizations 170,084 84,509
Net equity with futures commission merchants 248,879 294,884
Unsettled trades with clearing organization 120,093 193,544
Securities failed to deliver 123,219 218,663
Commissions and fees 6,683 7,697
Total receivables from broker-dealers and clearing organizations 1,187,720 1,101,449
Liabilities    
Due to prime brokers 501,190 354,300
Net equity with futures commission merchants 47,680 47,998
Unsettled trades with clearing organization 227,880 90,021
Securities failed to receive 209,517 73,547
Commissions and fees 1,575 1,575
Total payables to broker-dealers and clearing organizations 987,842 567,441
Outstanding principal balance $ 136,100 $ 184,600