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Secured Debt Arrangements, Net - Additional Information (Details)
£ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
subsidiary
Jun. 30, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Borrowings outstanding $ 1,960,874,000   $ 1,330,847,000
Line of Credit [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility 2,682,937,000   2,290,139,000
Securities sold under agreements to repurchase, gross 1,981,181,000    
Borrowings outstanding 1,960,874,000   1,330,847,000
Line of Credit [Member] | JP Morgan Facility [Member]      
Debt Instrument [Line Items]      
Securities sold under agreements to repurchase, gross $ 1,000,854,000    
Line of Credit [Member] | DB Repurchase Facility [Member]      
Debt Instrument [Line Items]      
Extension option 1 year    
Maximum borrowing under facility $ 800,000,000    
Securities sold under agreements to repurchase, gross 625,376,000    
Borrowings outstanding 625,400,000 £ 118,300  
Line of Credit [Member] | Goldman Sachs Repurchase Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility 300,000,000   331,130,000
Securities sold under agreements to repurchase, gross 209,014,000    
Borrowings outstanding 209,014,000   $ 81,380,000
Line of Credit [Member] | Credit Suisse Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility 145,937,000    
Securities sold under agreements to repurchase, gross 145,937,000    
Borrowings outstanding $ 145,937,000 110,500  
JP Morgan Facility [Member] | Line of Credit [Member] | JP Morgan Facility [Member]      
Debt Instrument [Line Items]      
Number of subsidiaries | subsidiary 2    
Extension option 1 year    
Amended and Restated JPMorgan Facility [Member] | Line of Credit [Member] | JP Morgan Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility $ 1,382,000    
Securities sold under agreements to repurchase, gross 1,000,000,000 £ 38,000  
Repurchase Facility [Member] | Line of Credit [Member] | JP Morgan Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility 1,250,000    
Asset Specific Financing [Member] | Line of Credit [Member] | JP Morgan Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing under facility 132,000,000    
Line of credit, amount outstanding 132,000,000    
Asset Specific Financing [Member] | Line of Credit [Member] | DB Repurchase Facility [Member]      
Debt Instrument [Line Items]      
Line of credit, amount outstanding 55,000,000    
General Facility [Member] | Line of Credit [Member] | JP Morgan Facility [Member]      
Debt Instrument [Line Items]      
Line of credit, amount outstanding 1,300,000,000    
General Facility [Member] | Line of Credit [Member] | DB Repurchase Facility [Member]      
Debt Instrument [Line Items]      
Line of credit, amount outstanding $ 800,000,000