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Receivables from/Payables to Broker-Dealers and Clearing Organizations (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Due from prime brokers $ 153,716 $ 219,573
Deposits with clearing organizations 257,832 112,847
Net equity with futures commission merchants 308,964 203,711
Unsettled trades with clearing organization 430,514 173,778
Securities failed to deliver 271,287 248,088
Commissions and fees 11,726 14,021
Total receivables from broker-dealers and clearing organizations 1,434,039 972,018
Liabilities    
Due to prime brokers 390,364 197,439
Net equity with futures commission merchants 40,665 44,526
Unsettled trades with clearing organization 150,205 420,029
Securities failed to receive 65,715 51,143
Commissions and fees 1,839 3,068
Total payables to broker-dealers and clearing organizations 648,788 716,205
Outstanding principal balance $ 131,400 $ 205,700