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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Securities purchased under agreements to resell $ 589 $ 290
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned 911,468 837,584
Fair Value, Measurements, Nonrecurring [Member]    
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Other 1,720 2,411
Receivable from customers 753,625 720,777
Fair Value, Estimate Not Practicable, Investment 67,093 59,765
Drafts payable 13,533 16,348
Clearing organizations 27,874 28,777
Securities loaned 232,370 146,815
Fair Value, Estimate not Practicable, Due from Employees 43,921 44,058
Total Receivable from brokers, dealers and clearing organizations 180,268 166,493
Securities failed to receive 30,064 27,799
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 2,256 158
Bank call loans 0 15,000
Securities purchased under agreements to resell 589 290
Receivables from brokers 17,438 20,140
Securities failed to deliver 23,524 7,021
Securities borrowed 109,712 108,144
Deposits with clearing organization 24,729 33,079
Other 368,684 113,628
Total payables to brokers, dealers and clearing organizations 633,374 288,400
Payables to customers 334,376 336,616
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase 268,621 484,218
Fair Value, Estimate not Practicable, Senior Secured Notes 203,904 199,722
Fair Value, Estimate Not Practicable, Cash 72,573 80,175
Fair Value, Measurements, Nonrecurring [Member] | Carrying Value [Member]    
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Other 1,720 2,411
Receivable from customers 753,625 720,777
Fair Value, Estimate Not Practicable, Investment 67,093 59,765
Drafts payable 13,533 16,348
Clearing organizations 27,874 28,777
Securities loaned 232,370 146,815
Fair Value, Estimate not Practicable, Due from Employees 43,921 44,058
Total Receivable from brokers, dealers and clearing organizations 180,268 166,493
Securities failed to receive 30,064 27,799
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 2,256 158
Bank call loans 15,000
Securities purchased under agreements to resell 589 290
Receivables from brokers 17,438 20,140
Securities failed to deliver 23,524 7,021
Securities borrowed 109,712 108,144
Deposits with clearing organization 24,729 33,079
Other 368,684 113,628
Total payables to brokers, dealers and clearing organizations 633,374 288,400
Payables to customers 334,376 336,616
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase 268,621 484,218
Fair Value, Estimate not Practicable, Senior Secured Notes 200,000 200,000
Fair Value, Estimate Not Practicable, Cash 72,573 80,175
Fair Value, Measurements, Nonrecurring [Member] | Level 1    
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Drafts payable 13,533 16,348
Deposits with clearing organization 24,729 33,079
Fair Value, Estimate Not Practicable, Cash 72,573 80,175
Fair Value, Measurements, Nonrecurring [Member] | Level 2    
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Other 1,720 2,411
Receivable from customers 753,625 720,777
Fair Value, Estimate Not Practicable, Investment 67,093 59,765
Clearing organizations 27,874 28,777
Securities loaned 232,370 146,815
Fair Value, Estimate not Practicable, Due from Employees 43,921 44,058
Total Receivable from brokers, dealers and clearing organizations 180,268 166,493
Securities failed to receive 30,064 27,799
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 2,256 158
Bank call loans 15,000
Securities purchased under agreements to resell 589 290
Receivables from brokers 17,438 20,140
Securities failed to deliver 23,524 7,021
Securities borrowed 109,712 108,144
Other 368,684 113,628
Total payables to brokers, dealers and clearing organizations 633,374 288,400
Payables to customers 334,376 336,616
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase 268,621 484,218
Fair Value, Estimate not Practicable, Senior Secured Notes $ 203,904 $ 199,722