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Real Estate Investments, Net - Schedule of Future Minimum Rental Payments for Operating Leases (Details) $ in Thousands	Sep. 30, 2018 USD ($)	Sep. 30, 2018 € / $	Sep. 30, 2018 £ / $	Dec. 31, 2017 € / $	Dec. 31, 2017 £ / $
Real Estate [Abstract]
2018 (remainder)	$ 65,414
2019	264,029
2020	267,518
2021	268,287
2022	258,975
2023	234,943
Thereafter	777,237
Future minimum base rental cash payments	$ 2,136,403
Foreign currency exchange rate (gbp, eur per usd)		1.16	1.30	1.20	1.35

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

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Amount of required minimum rental payments receivable in the remainder of the fiscal year following the latest fiscal year ended for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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