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Secured Debt Arrangements, Net - Additional Information (Details)
£ in Thousands
1 Months Ended 3 Months Ended
Sep. 30, 2018
USD ($)
Jul. 31, 2018
Jun. 30, 2018
Nov. 30, 2017
USD ($)
extension
May 31, 2017
subsidiary
Jun. 30, 2019
USD ($)
extension
Jun. 30, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                
Borrowings Outstanding           $ 1,783,057,000   $ 1,879,522,000
Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing under facility           2,856,476,000   3,124,725,000
Balance           1,801,303,000    
Borrowings Outstanding           1,783,057,000   1,879,522,000
Line of Credit | JP Morgan Facility                
Debt Instrument [Line Items]                
Balance           760,612,000    
Line of Credit | DB Repurchase Facility                
Debt Instrument [Line Items]                
Maximum borrowing under facility $ 1,000,000,000.0              
Extension option 1 year              
Balance           571,502,000    
Borrowings Outstanding           571,500,000 £ 108,200  
Line of Credit | Goldman Sachs Repurchase Facility                
Debt Instrument [Line Items]                
Maximum borrowing under facility       $ 300,000,000.0   500,000,000   300,000,000
Number of extensions available | extension       2        
Extension option       1 year        
Balance           112,713,000    
Borrowings Outstanding           112,713,000   210,072,000
Line of Credit | Credit Suisse Facility                
Debt Instrument [Line Items]                
Borrowings Outstanding           144,400,000    
Term after either party notifies the other party of intention to terminate     6 months          
Line of Credit | HSBC Facility                
Debt Instrument [Line Items]                
Balance           37,834,000    
Line of credit, amount outstanding           37,800,000    
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           $ 1,000,000,000.0    
Number of extensions available | extension           2    
Extension option           1 year    
Balance           $ 760,600,000 38,000  
USD | Line of Credit | JP Morgan Facility                
Debt Instrument [Line Items]                
Maximum borrowing under facility           951,723,000   1,333,503,000
Borrowings Outstanding           712,335,000   680,141,000
USD | Line of Credit | DB Repurchase Facility                
Debt Instrument [Line Items]                
Maximum borrowing under facility           862,588,000   904,181,000
Borrowings Outstanding           434,090,000   419,823,000
USD | Line of Credit | Credit Suisse Facility                
Debt Instrument [Line Items]                
Maximum borrowing under facility           174,278,000   187,117,000
Balance           174,278,000    
Borrowings Outstanding           174,278,000   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           48,277,000   48,497,000
Borrowings Outstanding           48,277,000   48,497,000
GBP | Line of Credit | DB Repurchase Facility                
Debt Instrument [Line Items]                
Maximum borrowing under facility           137,412,000   150,819,000
Borrowings Outstanding           137,412,000   150,819,000
GBP | Line of Credit | Credit Suisse Facility                
Debt Instrument [Line Items]                
Maximum borrowing under facility           144,364,000   151,773,000
Balance | £             144,364  
Borrowings Outstanding           144,364,000 113,700 151,773,000
GBP | Line of Credit | HSBC Facility                
Debt Instrument [Line Items]                
Maximum borrowing under facility           37,834,000   48,835,000
Borrowings Outstanding           $ 37,834,000   $ 48,835,000
Line of credit, amount outstanding | £             £ 29,800