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Secured Debt Arrangements, Net - Additional Information (Details)
£ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2019
USD ($)
extension
Jul. 31, 2018
Jun. 30, 2018
May 31, 2017
subsidiary
Sep. 30, 2019
USD ($)
extension
Sep. 30, 2019
USD ($)
Sep. 30, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Nov. 30, 2017
USD ($)
Debt Instrument [Line Items]                  
Borrowings Outstanding         $ 2,541,287,000 $ 2,541,287,000   $ 1,879,522,000  
Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         3,535,331,000 3,535,331,000   3,124,725,000  
Balance         2,559,318,000 2,559,318,000      
Borrowings Outstanding         2,541,287,000 2,541,287,000   1,879,522,000  
Line of Credit | JP Morgan Facility                  
Debt Instrument [Line Items]                  
Balance         1,114,364,000 1,114,364,000      
Line of Credit | DB Repurchase Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         1,250,000,000 $ 1,250,000,000      
Extension option           1 year      
Balance         691,912,000 $ 691,912,000      
Borrowings Outstanding         691,900,000 691,900,000 £ 108,200    
Line of Credit | Goldman Sachs Repurchase Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility $ 500,000,000.0       500,000,000 500,000,000   300,000,000 $ 300,000,000.0
Number of extensions available | extension 2                
Extension option 1 year                
Balance         267,711,000 267,711,000      
Borrowings Outstanding         267,711,000 267,711,000   210,072,000  
JP Morgan Facility | Line of Credit | JP Morgan Facility                  
Debt Instrument [Line Items]                  
Number of subsidiaries | subsidiary       2          
Amended and Restated JPMorgan Facility | Line of Credit | JP Morgan Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         $ 1,300,000,000 1,300,000,000      
Number of extensions available | extension         2        
Extension option         1 year        
Balance         $ 1,100,000,000 1,100,000,000 38,000    
USD | Line of Credit | JP Morgan Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         1,253,271,000 1,253,271,000   1,333,503,000  
Borrowings Outstanding         1,067,635,000 1,067,635,000   680,141,000  
USD | Line of Credit | DB Repurchase Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         1,116,993,000 1,116,993,000   904,181,000  
Borrowings Outstanding         558,905,000 558,905,000   419,823,000  
USD | Line of Credit | Credit Suisse Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         174,279,000 174,279,000   187,117,000  
Balance         174,279,000 174,279,000      
Borrowings Outstanding         174,279,000 174,279,000   187,117,000  
Term after either party notifies the other party of intention to terminate   6 months              
GBP | Line of Credit | JP Morgan Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         46,729,000 46,729,000   48,497,000  
Borrowings Outstanding         46,729,000 46,729,000   48,497,000  
GBP | Line of Credit | DB Repurchase Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         133,007,000 133,007,000   150,819,000  
Borrowings Outstanding         133,007,000 133,007,000   150,819,000  
GBP | Line of Credit | Credit Suisse Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         124,707,000 124,707,000   151,773,000  
Balance | £             124,707    
Borrowings Outstanding         124,707,000 124,707,000 101,500 151,773,000  
Term after either party notifies the other party of intention to terminate     6 months            
GBP | Line of Credit | HSBC Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         36,621,000 36,621,000   48,835,000  
Balance         36,621,000 36,621,000      
Borrowings Outstanding         36,621,000 36,621,000   48,835,000  
Line of credit, amount outstanding         36,600,000 36,600,000 29,800    
EUR | Line of Credit | HSBC Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         149,724,000 149,724,000   0  
Balance         149,724,000 149,724,000      
Borrowings Outstanding         149,724,000 149,724,000   $ 0  
Line of credit, amount outstanding         $ 149,700,000 $ 149,700,000 £ 137,400