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Secured Debt Arrangements, Net - Weighted Average Maturities and Interest Rates of Borrowings (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 GBP (£)	Dec. 31, 2017 GBP (£)
Debt Instrument [Line Items]
Borrowings outstanding	$ 1,996,871,000	$ 1,330,847,000
less: deferred financing costs	(16,746,000)	(14,348,000)
Line of Credit [Member]
Debt Instrument [Line Items]
Maximum Amount of Borrowings	3,000,830,000	2,290,139,000
Borrowings outstanding	1,996,871,000	1,330,847,000
less: deferred financing costs	$ (16,746,000)	$ (14,348,000)
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Rate	2.26%	2.37%
Line of Credit [Member] | GBP London Interbank Offered Rate (LIBOR) [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Rate	2.27%	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	$ 3,000,830,000	$ 2,290,139,000
Borrowings outstanding	2,013,617,000	$ 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	543,600,000		£ 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
Borrowings outstanding	205,982,000	$ 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	1,332,450,000	$ 1,393,000,000
Borrowings outstanding	950,635,000	944,529,000
USD | Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]
Debt Instrument [Line Items]
Maximum Amount of Borrowings	900,905,000	472,090,000
Borrowings outstanding	389,525,000	$ 225,367,000
USD | Line of Credit [Member] | Credit Suisse Facility [Member]
Debt Instrument [Line Items]
Maximum Amount of Borrowings	69,941,000
Borrowings outstanding	69,941,000
GBP | Line of Credit [Member] | JP Morgan Facility [Member]
Debt Instrument [Line Items]
Maximum Amount of Borrowings	49,550,000
Borrowings outstanding	49,550,000
GBP | Line of Credit [Member] | Deutsche Bank Repurchase Facility [Member]
Debt Instrument [Line Items]
Maximum Amount of Borrowings | £			154,095,000	£ 93,919,000
Borrowings outstanding | £			154,095,000	£ 93,919,000
GBP | Line of Credit [Member] | Credit Suisse Facility [Member]
Debt Instrument [Line Items]
Maximum Amount of Borrowings	143,993,000
Borrowings outstanding	143,993,000		£ 110,500,000
GBP | Line of Credit [Member] | HSBC Facility [Member]
Debt Instrument [Line Items]
Maximum Amount of Borrowings	49,896,000
Borrowings outstanding	$ 49,896,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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