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Mortgage Notes Payable, Net - Schedule of Maturities of Long-term Debt (Details) $ in Thousands | Sep. 30, 2018 USD ($) | Sep. 30, 2018 € / $ | Sep. 30, 2018 £ / $ | Dec. 31, 2017 USD ($) | Dec. 31, 2017 € / $ | Dec. 31, 2017 £ / $
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Foreign currency exchange rate (gbp, eur per usd) |  | 1.16 | 1.30 |  | 1.20 | 1.35
Mortgage notes payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
2018 (remainder) | $ 0 |  |  |  |  |
2019 | 237,587 |  |  |  |  |
2020 | 209,796 |  |  |  |  |
2021 | 16,827 |  |  |  |  |
2022 | 0 |  |  |  |  |
2023 | 299,674 |  |  |  |  |
Thereafter | 219,750 |  |  |  |  |
Mortgage notes payable | $ 983,634 |  |  | $ 992,344 |  |

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