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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
GBP (£)
Nov. 30, 2017
USD ($)
Debt Instrument [Line Items]            
Borrowings outstanding $ 1,879,522,000 $ 1,330,847,000        
less: deferred financing costs (17,555,000) (14,348,000)        
Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 3,124,725,000 2,290,139,000        
Borrowings outstanding 1,879,522,000 1,330,847,000        
less: deferred financing costs $ (17,555,000) $ (14,348,000)        
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Weighted Average Rate 2.17% 2.37%        
Line of Credit [Member] | GBP London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Weighted Average Rate 2.28% 2.60%        
Line of Credit [Member] | JP Morgan Chase, DB Repurchase Facility, Goldman Sachs, Credit Suisse and HSBC Facilities [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings $ 3,124,725,000 $ 2,290,139,000        
Borrowings outstanding 1,897,077,000 $ 1,345,195,000        
Line of Credit [Member] | JP Morgan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Weighted Average Rate   2.30%        
Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings       $ 1,000,000,000    
Borrowings outstanding 570,600,000   £ 118,300,000      
Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Weighted Average Rate   2.56%        
Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member] | GBP London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Weighted Average Rate   2.60%        
Line of Credit [Member] | Goldman Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 300,000,000 $ 331,130,000       $ 300,000,000
Borrowings outstanding 210,072,000 $ 81,380,000        
Line of Credit [Member] | Goldman Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Weighted Average Rate   2.73%        
USD | Line of Credit [Member] | JP Morgan Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 1,333,503,000 $ 1,393,000,000        
Borrowings outstanding 680,141,000 944,529,000        
USD | Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 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 Amount of Borrowings 187,117,000          
Borrowings outstanding 187,117,000          
GBP | Line of Credit [Member] | JP Morgan Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 48,497,000          
Borrowings outstanding 48,497,000          
GBP | Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings | £     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 Amount of Borrowings 151,773,000          
Borrowings outstanding 151,773,000   £ 119,000,000      
GBP | Line of Credit [Member] | HSBC Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 48,835,000          
Borrowings outstanding $ 48,835,000