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Financial Assets and Liabilities - Not measured at fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Financial Instruments Not Measured at Fair Value        
Cash and cash equivalents $ 637,308 $ 532,887 $ 164,967 $ 181,415
Securities borrowed 1,232,048 1,471,172    
Securities purchased under agreements to resell 602 0    
Receivables from broker dealers and clearing organizations 1,434,039 972,018    
Total assets 7,757,931 7,320,006    
Short-term borrowings 20,944 27,883    
Long-term borrowings 1,121,464 1,388,548    
Securities loaned 936,061 754,687    
Securities sold under agreements to repurchase 265,401 390,642    
Payables to broker dealers and clearing organizations 648,788 716,205    
Total liabilities 6,299,456 6,168,428    
Carrying Value        
Financial Instruments Not Measured at Fair Value        
Cash and cash equivalents 637,308 532,887    
Securities borrowed 1,232,048 1,471,172    
Securities purchased under agreements to resell 602      
Receivables from broker dealers and clearing organizations 1,434,039 972,018    
Total assets 3,303,997 2,976,077    
Short-term borrowings 20,944 27,883    
Long-term borrowings 1,121,464 1,388,548    
Securities loaned 936,061 754,687    
Securities sold under agreements to repurchase 265,401 390,642    
Payables to broker dealers and clearing organizations 648,788 716,205    
Total liabilities 2,992,658 3,277,965    
Fair value measurements not measured on a recurring basis | Fair Value        
Financial Instruments Not Measured at Fair Value        
Cash and cash equivalents 637,308 532,887    
Securities borrowed 1,232,048 1,471,172    
Securities purchased under agreements to resell 602      
Receivables from broker dealers and clearing organizations 1,434,039 972,018    
Total assets 3,303,997 2,976,077    
Short-term borrowings 20,944 27,883    
Long-term borrowings 1,193,167 1,465,489    
Securities loaned 936,061 754,687    
Securities sold under agreements to repurchase 265,401 390,642    
Payables to broker dealers and clearing organizations 648,788 716,205    
Total liabilities 3,064,361 3,354,906    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value measurements not measured on a recurring basis | Fair Value        
Financial Instruments Not Measured at Fair Value        
Cash and cash equivalents 637,308 532,887    
Securities borrowed 0 0    
Securities purchased under agreements to resell 0      
Receivables from broker dealers and clearing organizations 70,143 36,513    
Total assets 707,451 569,400    
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 861 2,925    
Total liabilities 861 2,925    
Significant Other Observable Inputs (Level 2) | Fair value measurements not measured on a recurring basis | Fair Value        
Financial Instruments Not Measured at Fair Value        
Cash and cash equivalents 0 0    
Securities borrowed 1,232,048 1,471,172    
Securities purchased under agreements to resell 602      
Receivables from broker dealers and clearing organizations 1,363,896 935,505    
Total assets 2,596,546 2,406,677    
Short-term borrowings 20,944 27,883    
Long-term borrowings 1,193,167 1,465,489    
Securities loaned 936,061 754,687    
Securities sold under agreements to repurchase 265,401 390,642    
Payables to broker dealers and clearing organizations 647,927 713,280    
Total liabilities 3,063,500 3,351,981    
Significant Unobservable Inputs (Level 3) | Fair value measurements not measured on a recurring basis | Fair Value        
Financial Instruments Not Measured at Fair Value        
Cash and cash equivalents 0 0    
Securities borrowed 0 0    
Securities purchased under agreements to resell 0      
Receivables from broker dealers and clearing organizations 0 0    
Total assets 0 0    
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