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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
GBP (£)
Dec. 31, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Debt Instrument [Line Items]            
Borrowings outstanding $ 2,141,939,000 $ 1,879,522,000        
less: deferred financing costs (17,828,000) (17,555,000)        
Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 3,241,167,000 3,124,725,000        
Borrowings outstanding 2,141,939,000 1,879,522,000        
less: deferred financing costs $ (17,828,000) $ (17,555,000)        
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Weighted Average Rate 2.19% 2.17%        
Line of Credit [Member] | GBP London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Weighted Average Rate 2.30% 2.28%        
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 $ 3,241,167,000 $ 3,124,725,000        
Borrowings outstanding 2,159,767,000 1,897,077,000        
Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings         $ 1,000,000,000  
Borrowings outstanding 617,000,000   £ 108,200,000      
Line of Credit [Member] | Goldman Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 500,000,000 300,000,000       $ 300,000,000.0
Borrowings outstanding 233,312,000 210,072,000        
USD | Line of Credit [Member] | JP Morgan Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 1,305,435,000 1,333,503,000        
Borrowings outstanding 873,771,000 680,141,000        
USD | Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 858,918,936 904,181,000        
Borrowings outstanding 475,871,000 419,823,000        
USD | Line of Credit [Member] | Credit Suisse Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 188,037,000 187,117,000        
Borrowings outstanding 188,037,000 187,117,000        
GBP | Line of Credit [Member] | JP Morgan Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 49,565,000 48,497,000        
Borrowings outstanding 49,565,000 48,497,000        
GBP | Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings | £     141,081,064 £ 150,819,000    
Borrowings outstanding | £     141,081,000 £ 150,819,000    
GBP | Line of Credit [Member] | Credit Suisse Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 148,219,000 151,773,000        
Borrowings outstanding 148,200,000 151,773,000 £ 113,700,000      
GBP | Line of Credit [Member] | HSBC Facility [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 49,911,000 48,835,000        
Borrowings outstanding $ 49,911,000 $ 48,835,000