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Borrowings - Broker-Dealer Credit Facilities (Details)
 3 Months Ended
Nov. 03, 2017
USD ($)
borrowing_base
broker_dealer
Mar. 31, 2018
USD ($)
broker_dealer
subsidiary
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Nov. 02, 2017
USD ($)
Long-Term Borrowings          
Number of borrowing bases | borrowing_base 2        
Number of broker-dealer subsidiaries 3 3      
Borrowing Outstanding   $ 1,156,932,000      
Outstanding Borrowings, net   1,121,464,000   $ 1,388,548,000  
Interest expense   $ 19,047,000 $ 6,828,000    
LIBOR rate          
Long-Term Borrowings          
Interest rate margin (as a percent) 1.25%        
Broker-Dealer Credit Facilities          
Long-Term Borrowings          
Number of secured credit facilities | broker_dealer   2      
Financing Available $ 500,000,000 $ 850,000,000   650,000,000 $ 25,000,000
Maximum borrowing capacity $ 100,000,000       $ 40,000,000
Number of broker-dealer subsidiaries the committed facility is available to | broker_dealer 2        
Commitment fee (as a percent) 0.50%        
Borrowing Outstanding   24,500,000   32,000,000  
Deferred Debt Issuance Cost   (3,556,000)   (4,117,000)  
Outstanding Borrowings, net   20,944,000   27,883,000  
Interest expense   $ 544,000 422,000    
Broker-Dealer Credit Facilities | LIBOR rate          
Long-Term Borrowings          
Interest rate margin (as a percent) 2.50%        
Broker-Dealer Credit Facility on an uncommitted basis          
Long-Term Borrowings          
Number of secured credit facilities | broker_dealer   1      
Financing Available   $ 350,000,000   $ 150,000,000  
Interest rate (as a percent)   2.68%   2.42%  
Borrowing Outstanding   $ 17,500,000   $ 25,000,000  
Deferred Debt Issuance Cost   (1,580,000)   0  
Outstanding Borrowings, net   15,920,000   25,000,000  
Interest expense   446,000 415,000    
Broker-Dealer Credit Facility on committed basis          
Long-Term Borrowings          
Interest expense   0 7,000    
Revolving credit facility          
Long-Term Borrowings          
Financing Available   $ 500,000,000   $ 500,000,000  
Interest rate (as a percent)   3.13%   2.81%  
Borrowing Outstanding   $ 7,000,000   $ 7,000,000  
Deferred Debt Issuance Cost   (1,976,000)   (4,117,000)  
Outstanding Borrowings, net   5,024,000   $ 2,883,000  
Interest expense   $ 98,000 $ 0