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Borrowings - Broker-Dealer Credit Facilities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
item
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Apr. 24, 2015
USD ($)
Credit Facilities        
Interest expense $ 7,101 $ 7,602    
Broker-Dealer Credit Facilities        
Credit Facilities        
Number of secured credit facilities | item 2      
Broker-Dealer Credit Facility on an uncommitted basis        
Credit Facilities        
Maximum borrowing capacity $ 125,000      
Interest rate (as a percent) 1.26%   1.25%  
Interest expense $ 300 $ 100    
Outstanding principal balance $ 32,000   $ 45,000  
Broker-Dealer Credit Facility on committed basis        
Credit Facilities        
Maximum borrowing capacity       $ 75,000
Credit facility term 364 days      
Outstanding principal balance $ 0   $ 0  
Broker-Dealer Credit Facility on committed basis | LIBOR rate        
Credit Facilities        
Interest rate margin (as a percent) 1.25%      
Broker-Dealer Credit Facility on committed basis | Base rate        
Credit Facilities        
Interest rate margin (as a percent) 1.25%