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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 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 $ 999,627 $ 926,597
Securities purchased under agreements to resell, at fair value 0 658
Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 32,225 37,664
Deposits with clearing organization 29,551 7,929
Securities borrowed 112,272 132,368
Receivables from brokers 15,333 19,298
Securities failed to deliver 16,862 9,442
Clearing organizations 24,296 24,361
Other 2,007 930
Total Receivable from brokers, dealers and clearing organizations 170,770 186,399
Receivable from customers 881,941 848,226
Securities purchased under agreements to resell, at fair value   658
Fair Value, Estimate not Practicable, Due from Employees 42,386 40,520
Drafts payable 20,993 42,212
Bank call loans 147,400 118,300
Securities loaned 174,567 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 3,405 1,567
Securities failed to receive 23,677 17,559
Other 51,984 10,707
Total payables to brokers, dealers and clearing organizations 253,633 210,103
Payables to customers 445,085 385,907
Securities sold under agreements to repurchase 576,017 586,478
Senior secured notes 206,488 206,380
Fair Value, Estimate Not Practicable, Investments 65,563 65,404
Level 1 | Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 32,225 37,664
Deposits with clearing organization 29,551 7,929
Drafts payable 20,993 42,212
Level 2 | Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Securities borrowed 112,272 132,368
Receivables from brokers 15,333 19,298
Securities failed to deliver 16,862 9,442
Clearing organizations 24,296 24,361
Other 2,007 930
Total Receivable from brokers, dealers and clearing organizations 170,770 186,399
Receivable from customers 881,941 848,226
Securities purchased under agreements to resell, at fair value   658
Fair Value, Estimate not Practicable, Due from Employees 42,386 40,520
Bank call loans 147,400 118,300
Securities loaned 174,567 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 3,405 1,567
Securities failed to receive 23,677 17,559
Other 51,984 10,707
Total payables to brokers, dealers and clearing organizations 253,633 210,103
Payables to customers 445,085 385,907
Securities sold under agreements to repurchase 576,017 586,478
Senior secured notes 206,488 206,380
Fair Value, Estimate Not Practicable, Investments 65,563 65,404
Carrying Value [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments Not Measured at Fair Value on Recurring Basis [Line items]    
Cash 32,225 37,664
Deposits with clearing organization 29,551 7,929
Securities borrowed 112,272 132,368
Receivables from brokers 15,333 19,298
Securities failed to deliver 16,862 9,442
Clearing organizations 24,296 24,361
Other 2,007 930
Total Receivable from brokers, dealers and clearing organizations 170,770 186,399
Receivable from customers 881,941 848,226
Securities purchased under agreements to resell, at fair value   658
Fair Value, Estimate not Practicable, Due from Employees 42,386 40,520
Drafts payable 20,993 42,212
Bank call loans 147,400 118,300
Securities loaned 174,567 180,270
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 3,405 1,567
Securities failed to receive 23,677 17,559
Other 51,984 10,707
Total payables to brokers, dealers and clearing organizations 253,633 210,103
Payables to customers 445,085 385,907
Securities sold under agreements to repurchase 576,017 586,478
Senior secured notes 200,000 200,000
Fair Value, Estimate Not Practicable, Investments $ 65,563 $ 65,404