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Borrowings - Broker-Dealer Credit Facilities Carrying Values, Net (Details) - USD ($)
Mar. 31, 2019
Mar. 01, 2019
Dec. 31, 2018
Nov. 03, 2017
Line of Credit Facility [Line Items]        
Borrowing Outstanding $ 2,031,571,000      
Outstanding Borrowings, net $ 1,977,716,000   $ 907,037,000  
Uncommitted facility        
Line of Credit Facility [Line Items]        
Interest Rate 3.40%   3.40%  
Financing Available $ 200,000,000   $ 200,000,000  
Borrowing Outstanding 10,000,000   10,000,000  
Deferred Debt Issuance Cost (708,000)   (832,000)  
Outstanding Borrowings, net $ 9,292,000   $ 9,168,000  
Committed facility        
Line of Credit Facility [Line Items]        
Interest Rate 3.74%   3.75%  
Financing Available $ 600,000,000   $ 500,000,000  
Borrowing Outstanding 7,000,000   7,000,000  
Deferred Debt Issuance Cost (930,000)   (1,040,000)  
Outstanding Borrowings, net 6,070,000   5,960,000  
Broker-dealer credit facilities        
Line of Credit Facility [Line Items]        
Financing Available 800,000,000 $ 600,000,000 700,000,000 $ 500,000,000
Borrowing Outstanding 17,000,000   17,000,000  
Deferred Debt Issuance Cost (1,638,000)   (1,872,000)  
Outstanding Borrowings, net $ 15,362,000   $ 15,128,000