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Impairments (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) property | Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) property
Asset Impairment Charges [Abstract] |  |  |  |
Total provisions for impairment | $ | $ 6,900 | $ 365 | $ 25,000 | $ 8,100
Number of impaired properties held-for-sale | 12 |  | 16 |
Number of impaired properties held-for-investment |  |  | 2 | 4
Number of impaired properties sold | 7 | 4 | 21 | 17

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