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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Receivable from brokers, dealers and clearing organizations:    
Securities Purchased under Agreements to Resell $ 0 $ 24,006
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value Measurement: Assets    
Cash 34,304 48,671
Deposits with clearing organization 14,753 11,748
Receivable from brokers, dealers and clearing organizations:    
Securities borrowed 159,230 154,090
Receivables from brokers 30,964 25,768
Securities failed to deliver 34,305 6,172
Clearing organizations 21,921 26,081
Other 1,132 2,823
Total Receivable from brokers, dealers and clearing organizations 247,552 214,934
Receivable from customers 775,602 847,386
Investments 62,410 56,300
Fair Value Measurement: Liabilities    
Drafts payable 26,480 39,228
Bank call loans 130,100 145,800
Payables to brokers, dealers and clearing organizations:    
Securities loaned 179,159 179,875
Payable to brokers 5,997 610
Securities failed to receive 9,253 11,523
Other 51,177 29,381
Total payables to brokers, dealers and clearing organizations 245,586 221,389
Payables to customers 396,515 449,946
Securities sold under agreements to repurchase 398,650 378,084
Senior secured notes 203,044 151,782
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]    
Fair Value Measurement: Assets    
Cash 34,304 48,671
Deposits with clearing organization 14,753 11,748
Fair Value Measurement: Liabilities    
Drafts payable 26,480 39,228
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]    
Receivable from brokers, dealers and clearing organizations:    
Securities borrowed 159,230 154,090
Receivables from brokers 30,964 25,768
Securities failed to deliver 34,305 6,172
Clearing organizations 21,921 26,081
Other 1,132 2,823
Total Receivable from brokers, dealers and clearing organizations 247,552 214,934
Receivable from customers 775,602 847,386
Investments 62,410 56,300
Fair Value Measurement: Liabilities    
Bank call loans 130,100 145,800
Payables to brokers, dealers and clearing organizations:    
Securities loaned 179,159 179,875
Payable to brokers 5,997 610
Securities failed to receive 9,253 11,523
Other 51,177 29,381
Total payables to brokers, dealers and clearing organizations 245,586 221,389
Payables to customers 396,515 449,946
Securities sold under agreements to repurchase 398,650 378,084
Senior secured notes 203,044 151,782
Fair Value, Estimate Not Practicable, Carrying (Reported) Amount [Member]    
Fair Value Measurement: Assets    
Cash 34,304 48,671
Deposits with clearing organization 14,753 11,748
Receivable from brokers, dealers and clearing organizations:    
Securities borrowed 159,230 154,090
Receivables from brokers 30,964 25,768
Securities failed to deliver 34,305 6,172
Clearing organizations 21,921 26,081
Other 1,132 2,823
Total Receivable from brokers, dealers and clearing organizations 247,552 214,934
Receivable from customers 775,602 847,386
Investments 62,410 56,300
Fair Value Measurement: Liabilities    
Drafts payable 26,480 39,228
Bank call loans 130,100 145,800
Payables to brokers, dealers and clearing organizations:    
Securities loaned 179,159 179,875
Payable to brokers 5,997 610
Securities failed to receive 9,253 11,523
Other 51,177 29,381
Total payables to brokers, dealers and clearing organizations 245,586 221,389
Payables to customers 396,515 449,946
Securities sold under agreements to repurchase 398,650 378,084
Senior secured notes $ 200,000 $ 150,000