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Secured Debt Arrangements, Net - Additional Information (Details)
1 Months Ended 12 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Nov. 30, 2017
USD ($)
May 31, 2017
USD ($)
subsidiary
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Debt Instrument [Line Items]                  
Borrowings outstanding         $ 1,879,522,000     $ 1,330,847,000  
Line of Credit [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         3,124,725,000     2,290,139,000  
Securities sold under agreements to repurchase, gross         1,897,077,000        
Borrowings outstanding         1,879,522,000     1,330,847,000  
Line of Credit [Member] | JP Morgan Facility [Member]                  
Debt Instrument [Line Items]                  
Securities sold under agreements to repurchase, gross         $ 728,638,000        
Line of Credit [Member] | DB Repurchase Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility             $ 1,000,000,000    
Extension option         1 year        
Securities sold under agreements to repurchase, gross         $ 570,642,000        
Borrowings outstanding         570,600,000 £ 118,300,000      
Line of Credit [Member] | Goldman Sachs Repurchase Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility     $ 300,000,000   300,000,000     331,130,000  
Extension option     1 year            
Securities sold under agreements to repurchase, gross         210,072,000        
Borrowings outstanding         210,072,000     81,380,000  
Line of Credit [Member] | Credit Suisse Facility [Member]                  
Debt Instrument [Line Items]                  
Term after either party notifies the other party of intention to terminate   6 months              
Line of Credit [Member] | HSBC Facility [Member]                  
Debt Instrument [Line Items]                  
Securities sold under agreements to repurchase, gross         48,835,000        
Line of credit, amount outstanding         48,800,000 38,300,000      
JP Morgan Facility [Member] | Line of Credit [Member] | JP Morgan Facility [Member]                  
Debt Instrument [Line Items]                  
Number of subsidiaries | subsidiary       2          
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          
Extension option       1 year          
Securities sold under agreements to repurchase, gross         728,600,000 38,000,000      
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          
Asset Specific Financing [Member] | Line of Credit [Member] | DB Repurchase Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit, amount outstanding         54,700,000        
USD | Line of Credit [Member] | JP Morgan Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         1,333,503,000     1,393,000,000  
Borrowings outstanding         680,141,000     944,529,000  
USD | Line of Credit [Member] | DB Repurchase Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         904,181,000     472,090,000  
Borrowings outstanding         419,823,000     $ 225,367,000  
USD | Line of Credit [Member] | Credit Suisse Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         187,117,000        
Securities sold under agreements to repurchase, gross         187,117,000        
Borrowings outstanding         187,117,000        
Term after either party notifies the other party of intention to terminate 6 months                
GBP | Line of Credit [Member] | JP Morgan Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         48,497,000        
Borrowings outstanding         48,497,000        
GBP | Line of Credit [Member] | DB Repurchase Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility | £           150,819,000     £ 93,919,000
Borrowings outstanding | £           150,819,000     £ 93,919,000
GBP | Line of Credit [Member] | Credit Suisse Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         151,773,000        
Securities sold under agreements to repurchase, gross         151,773,000        
Borrowings outstanding         151,773,000 £ 119,000,000      
GBP | Line of Credit [Member] | HSBC Facility [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing under facility         48,835,000        
Borrowings outstanding         $ 48,835,000