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Real Estate Assets (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) propertyUnit | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) propertyUnit | Jun. 30, 2018 USD ($)
Dispositions [Abstract] |  |  |  |
Gains on disposition of property | $ 6,703 | $ 16,972 | $ 6,703 | $ 16,972
Impairments [Abstract] |  |  |  |
Impairments of real estate assets | $ 531 | $ 0 | $ 531 | $ 0
2019 Dispositions [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Number of buildings sold | propertyUnit | 2 |  | 2 |
Purchase price of real estate | $ 32,500 |  |  |
Gains on disposition of property | 6,700 |  |  |
2019 Impairments [Member] |  |  |  |
Impairments [Abstract] |  |  |  |
Impairments of real estate assets | $ 500 |  |  |

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