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Mortgage Notes Payable, Net - Schedule of Maturities of Long-term Debt (Details) $ in Thousands | Mar. 31, 2019 $ / € | Mar. 31, 2019 USD ($) | Mar. 31, 2019 $ / £ | Dec. 31, 2018 $ / € | Dec. 31, 2018 USD ($) | Dec. 31, 2018 $ / £ | Dec. 31, 2018 £ / $ | Dec. 31, 2018 € / $
--- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Foreign currency exchange rate (gbp, eur per usd) | 1.12 |  | 1.30 | 1.14 |  | 1.27 | 1.27 | 1.14
Mortgage notes payable |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
2019 (remainder) |  | $ 214,499 |  |  |  |  |  |
2020 |  | 142,144 |  |  |  |  |  |
2021 |  | 28,890 |  |  |  |  |  |
2022 |  | 19,548 |  |  |  |  |  |
2023 |  | 258,140 |  |  |  |  |  |
2024 |  | 83,017 |  |  |  |  |  |
Thereafter |  | 395,100 |  |  |  |  |  |
Mortgage notes payable |  | $ 1,141,338 |  |  | $ 1,140,113 |  |  |

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