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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Details)
£ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2019
GBP (£)
Sep. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Debt Instrument [Line Items]          
Borrowings Outstanding $ 1,783,057,000 $ 1,879,522,000      
less: deferred financing costs (7,333,000) 0      
Line of Credit          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 2,856,476,000 3,124,725,000      
Borrowings Outstanding 1,783,057,000 1,879,522,000      
less: deferred financing costs $ (18,246,000) $ (17,555,000)      
Line of Credit | London Interbank Offered Rate (LIBOR) | Weighted Average          
Debt Instrument [Line Items]          
Weighted Average Rate 2.10% 2.17%      
Line of Credit | GBP London Interbank Offered Rate (LIBOR) | Weighted Average          
Debt Instrument [Line Items]          
Weighted Average Rate 2.30% 2.28%      
Line of Credit | JP Morgan Chase, DB Repurchase Facility, Goldman Sachs, Credit Suisse and HSBC Facilities [Member]          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings $ 2,856,476,000 $ 3,124,725,000      
Borrowings Outstanding 1,801,303,000 1,897,077,000      
Line of Credit | Deutsche Bank Repurchase Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings       $ 1,000,000,000.0  
Borrowings Outstanding 571,500,000   £ 108.2    
Line of Credit | Goldman Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 500,000,000 300,000,000     $ 300,000,000.0
Borrowings Outstanding 112,713,000 210,072,000      
Line of Credit | Credit Suisse Facility          
Debt Instrument [Line Items]          
Borrowings Outstanding 144,400,000        
USD | Line of Credit | JP Morgan Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 951,723,000 1,333,503,000      
Borrowings Outstanding 712,335,000 680,141,000      
USD | Line of Credit | Deutsche Bank Repurchase Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 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 Amount of Borrowings 174,278,000 187,117,000      
Borrowings Outstanding 174,278,000 187,117,000      
GBP | Line of Credit | JP Morgan Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 48,277,000 48,497,000      
Borrowings Outstanding 48,277,000 48,497,000      
GBP | Line of Credit | Deutsche Bank Repurchase Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 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 Amount of Borrowings 144,364,000 151,773,000      
Borrowings Outstanding 144,364,000 151,773,000 £ 113.7    
GBP | Line of Credit | HSBC Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 37,834,000 48,835,000      
Borrowings Outstanding $ 37,834,000 $ 48,835,000