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Financial Assets and Liabilities - Not Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets    
Cash and cash equivalents $ 771,003 $ 729,547
Cash restricted or segregated under regulations and other 17,324 6,500
Securities borrowed 1,282,867 1,399,684
Securities purchased under agreements to resell 5,655 15,475
Receivables from broker-dealers and clearing organizations 1,187,720 1,101,449
Total assets 9,076,973 7,380,978
Liabilities    
Short-term borrowings 159,716 15,128
Long-term borrowings 1,977,716 907,037
Securities loaned 819,903 1,130,039
Securities sold under agreements to repurchase 290,000 281,861
Payables to broker-dealers and clearing organizations 987,842 567,441
Total liabilities 7,640,327 5,886,279
Carrying Value    
Assets    
Cash and cash equivalents 771,003 736,047
Cash restricted or segregated under regulations and other 17,324  
Securities borrowed 1,282,867 1,399,684
Securities purchased under agreements to resell 5,655 15,475
Receivables from broker-dealers and clearing organizations 1,187,720 1,101,449
Total assets 3,264,569 3,252,655
Liabilities    
Short-term borrowings 159,716 15,128
Long-term borrowings 1,977,716 907,037
Securities loaned 819,903 1,130,039
Securities sold under agreements to repurchase 290,000 281,861
Payables to broker-dealers and clearing organizations 987,842 567,441
Total liabilities 4,235,177 2,901,506
Fair Value    
Assets    
Cash and cash equivalents 771,003 736,047
Cash restricted or segregated under regulations and other 17,324  
Securities borrowed 1,282,867 1,399,684
Securities purchased under agreements to resell 5,655 15,475
Receivables from broker-dealers and clearing organizations 1,187,720 1,101,449
Total assets 3,264,569 3,252,655
Liabilities    
Short-term borrowings 159,716 15,128
Long-term borrowings 2,052,816 916,465
Securities loaned 819,903 1,130,039
Securities sold under agreements to repurchase 290,000 281,861
Payables to broker-dealers and clearing organizations 987,842 567,441
Total liabilities 4,310,277 2,910,934
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Cash and cash equivalents 771,003 736,047
Cash restricted or segregated under regulations and other 17,324  
Securities borrowed 0 0
Securities purchased under agreements to resell 0 0
Receivables from broker-dealers and clearing organizations 5,001 71,288
Total assets 793,328 807,335
Liabilities    
Short-term borrowings 0 0
Long-term borrowings 0 0
Securities loaned 0 0
Securities sold under agreements to repurchase 0 0
Payables to broker-dealers and clearing organizations 3,836 1,031
Total liabilities 3,836 1,031
Fair Value | Significant Other Observable Inputs (Level 2)    
Assets    
Cash and cash equivalents 0 0
Cash restricted or segregated under regulations and other 0  
Securities borrowed 1,282,867 1,399,684
Securities purchased under agreements to resell 5,655 15,475
Receivables from broker-dealers and clearing organizations 1,182,719 1,030,161
Total assets 2,471,241 2,445,320
Liabilities    
Short-term borrowings 159,716 15,128
Long-term borrowings 2,052,816 916,465
Securities loaned 819,903 1,130,039
Securities sold under agreements to repurchase 290,000 281,861
Payables to broker-dealers and clearing organizations 984,006 566,410
Total liabilities 4,306,441 2,909,903
Fair Value | Significant Unobservable Inputs (Level 3)    
Assets    
Cash and cash equivalents 0 0
Cash restricted or segregated under regulations and other 0  
Securities borrowed 0 0
Securities purchased under agreements to resell 0 0
Receivables from broker-dealers and clearing organizations 0 0
Total assets 0 0
Liabilities    
Short-term borrowings 0 0
Long-term borrowings 0 0
Securities loaned 0 0
Securities sold under agreements to repurchase 0 0
Payables to broker-dealers and clearing organizations 0 0
Total liabilities $ 0 $ 0