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Receivables from/Payables to Broker-Dealers and Clearing Organizations (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Due from prime brokers $ 697,293 $ 418,059
Deposits with clearing organizations 216,962 231,977
Net equity with futures commission merchants 248,943 267,748
Unsettled trades with clearing organizations 118,777 214,618
Securities failed to deliver 372,965 178,324
Commissions and fees 29,066 7,858
Total receivables from broker-dealers and clearing organizations 1,684,006 1,318,584
Liabilities    
Due to prime brokers 410,772 511,524
Net equity with futures commission merchants 77,257 50,950
Unsettled trades with clearing organizations 228,070 118,286
Securities failed to receive 156,804 144,494
Commissions and fees 3,543 1,496
Total payables to broker-dealers and clearing organizations 876,446 826,750
Outstanding principal balance $ 134,700 $ 134,300