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Borrowings - Broker-Dealer Credit Facilities Carrying Values, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Borrowing Outstanding $ 1,670,410  
Deferred Debt Issuance Cost 387 $ 2,100
Outstanding Borrowings, net $ 1,639,280 $ 1,917,866
Uncommitted facility    
Line of Credit Facility [Line Items]    
Interest Rate 1.25% 2.55%
Financing Available $ 400,000 $ 200,000
Borrowing Outstanding 36,400 30,000
Deferred Debt Issuance Cost 387 2,100
Outstanding Borrowings, net $ 36,013 $ 27,900
Committed facility    
Line of Credit Facility [Line Items]    
Interest Rate 1.40% 3.01%
Financing Available $ 600,000 $ 600,000
Borrowing Outstanding 0 0
Deferred Debt Issuance Cost 0 0
Outstanding Borrowings, net 0 0
Broker-dealer credit facilities    
Line of Credit Facility [Line Items]    
Financing Available 1,000,000 800,000
Borrowing Outstanding 36,400 30,000
Deferred Debt Issuance Cost 387 2,100
Outstanding Borrowings, net $ 36,013 $ 27,900