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Fair Value Measurements - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Property | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Property | Sep. 30, 2017 USD ($) Property | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Number of properties impaired | Property | 2 |  | 3 | 3 |
Provision for asset impairment | $ 2,713 | $ 0 | $ 3,510 | $ 16,440 |
Mortgages payable | Weighted Average Effective Market Rate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input | 0.0471 |  | 0.0471 |  | 0.0420
Line of Credit | Discount Rate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input | 0.0408 |  | 0.0408 |  | 0.0348
Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Provision for asset impairment | $ 2,713 | $ 0 | $ 3,510 | $ 16,440 |

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