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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Details)
£ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2019
GBP (£)
Mar. 31, 2019
USD ($)
Nov. 30, 2017
USD ($)
Debt Instrument [Line Items]          
Borrowings Outstanding $ 2,541,287,000 $ 1,879,522,000      
less: deferred financing costs (7,452,000) 0      
Line of Credit          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 3,535,331,000 3,124,725,000      
Borrowings Outstanding 2,541,287,000 1,879,522,000      
less: deferred financing costs $ (18,031,000) $ (17,555,000)      
Line of Credit | London Interbank Offered Rate (LIBOR) | Weighted Average          
Debt Instrument [Line Items]          
Weighted Average Rate 2.09% 2.17%      
Line of Credit | GBP London Interbank Offered Rate (LIBOR) | Weighted Average          
Debt Instrument [Line Items]          
Weighted Average Rate 2.31% 2.28%      
Line of Credit | EUR London Interbank Offered Rate (LIBOR) | Weighted Average          
Debt Instrument [Line Items]          
Weighted Average Rate 1.35%        
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 $ 3,535,331,000 $ 3,124,725,000      
Borrowings Outstanding 2,559,318,000 1,897,077,000      
Line of Credit | Deutsche Bank Repurchase Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 1,250,000,000        
Borrowings Outstanding 691,900,000   £ 108.2    
Line of Credit | Goldman Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 500,000,000 300,000,000   $ 500,000,000.0 $ 300,000,000.0
Borrowings Outstanding 267,711,000 210,072,000      
USD | Line of Credit | JP Morgan Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 1,253,271,000 1,333,503,000      
Borrowings Outstanding 1,067,635,000 680,141,000      
USD | Line of Credit | Deutsche Bank Repurchase Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 1,116,993,000 904,181,000      
Borrowings Outstanding 558,905,000 419,823,000      
USD | Line of Credit | Credit Suisse Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 174,279,000 187,117,000      
Borrowings Outstanding 174,279,000 187,117,000      
GBP | Line of Credit | JP Morgan Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 46,729,000 48,497,000      
Borrowings Outstanding 46,729,000 48,497,000      
GBP | Line of Credit | Deutsche Bank Repurchase Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 133,007,000 150,819,000      
Borrowings Outstanding 133,007,000 150,819,000      
GBP | Line of Credit | Credit Suisse Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 124,707,000 151,773,000      
Borrowings Outstanding 124,707,000 151,773,000 £ 101.5    
GBP | Line of Credit | HSBC Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 36,621,000 48,835,000      
Borrowings Outstanding 36,621,000 48,835,000      
EUR | Line of Credit | HSBC Facility          
Debt Instrument [Line Items]          
Maximum Amount of Borrowings 149,724,000 0      
Borrowings Outstanding $ 149,724,000 $ 0