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Real Estate Assets (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) propertyUnit | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Dispositions [Abstract] |  |  |  |  |
Gains on disposition of property | $ 3,515 |  | $ 3 | $ 10,218 | $ 16,975
Impairments [Abstract] |  |  |  |  |
Impairments of real estate assets | 5,318 |  | $ 0 | $ 5,849 | $ 0
Raleigh NC Land Acquisition (7/2019) [Member] |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |
Acquisition purchase price | 6,600 |  |  |  |
2019 Dispositions [Member] |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |
Number of buildings sold | propertyUnit |  | 2 |  |  |
Purchase price of real estate | 14,300 | $ 32,500 |  |  |
Gains on disposition of property | 3,500 | 6,700 |  |  |
2019 Impairments [Member] |  |  |  |  |
Impairments [Abstract] |  |  |  |  |
Impairments of real estate assets | $ 5,300 | $ 500 |  |  |

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