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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 £ / $
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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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