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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned $ 1,020,404 $ 926,597
Securities purchased under agreements to resell, at fair value 6,738 658
Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 28,461 37,664
Deposits with clearing organization 25,729 7,929
Securities borrowed 122,238 132,368
Receivables from brokers 31,962 19,298
Securities failed to deliver 24,227 9,442
Clearing organizations 23,459 24,361
Other 1,603 930
Total Receivable from brokers, dealers and clearing organizations 203,489 186,399
Receivable from customers 835,708 848,226
Securities purchased under agreements to resell, at fair value 6,738 658
Fair Value, Estimate not Practicable, Due from Employees 42,410 40,520
Drafts payable 21,632 42,212
Bank call loans 107,500 118,300
Securities loaned 199,598 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 18,984 1,567
Securities failed to receive 16,894 17,559
Other 45,186 10,707
Total payables to brokers, dealers and clearing organizations 280,662 210,103
Payables to customers 373,664 385,907
Securities sold under agreements to repurchase 599,151 586,478
Senior secured notes 204,174 206,380
Fair Value, Estimate Not Practicable, Investments 65,601 65,404
Level 1 | Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 28,461 37,664
Deposits with clearing organization 25,729 7,929
Drafts payable 21,632 42,212
Level 2 | Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Securities borrowed 122,238 132,368
Receivables from brokers 31,962 19,298
Securities failed to deliver 24,227 9,442
Clearing organizations 23,459 24,361
Other 1,603 930
Total Receivable from brokers, dealers and clearing organizations 203,489 186,399
Receivable from customers 835,708 848,226
Securities purchased under agreements to resell, at fair value 6,738 658
Fair Value, Estimate not Practicable, Due from Employees 42,410 40,520
Bank call loans 107,500 118,300
Securities loaned 199,598 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 18,984 1,567
Securities failed to receive 16,894 17,559
Other 45,186 10,707
Total payables to brokers, dealers and clearing organizations 280,662 210,103
Payables to customers 373,664 385,907
Securities sold under agreements to repurchase 599,151 586,478
Senior secured notes 204,174 206,380
Fair Value, Estimate Not Practicable, Investments 65,601 65,404
Carrying Value [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 28,461 37,664
Deposits with clearing organization 25,729 7,929
Securities borrowed 122,238 132,368
Receivables from brokers 31,962 19,298
Securities failed to deliver 24,227 9,442
Clearing organizations 23,459 24,361
Other 1,603 930
Total Receivable from brokers, dealers and clearing organizations 203,489 186,399
Receivable from customers 835,708 848,226
Securities purchased under agreements to resell, at fair value 6,738 658
Fair Value, Estimate not Practicable, Due from Employees 42,410 40,520
Drafts payable 21,632 42,212
Bank call loans 107,500 118,300
Securities loaned 199,598 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 18,984 1,567
Securities failed to receive 16,894 17,559
Other 45,186 10,707
Total payables to brokers, dealers and clearing organizations 280,662 210,103
Payables to customers 373,664 385,907
Securities sold under agreements to repurchase 599,151 586,478
Senior secured notes 200,000 200,000
Fair Value, Estimate Not Practicable, Investments $ 65,601 $ 65,404