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Real Estate Assets (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) a | Mar. 31, 2018 USD ($) a parcel | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) a | Jun. 30, 2017 USD ($)
Acquisitions [Abstract] |  |  |  |  |
Undeveloped land suitable for future development (in acres) | a | 400 |  |  | 400 |
Dispositions [Abstract] |  |  |  |  |
Gains on disposition of property | $ 16,972 |  | $ 0 | $ 16,972 | $ 5,332
Nashville TN Land Acquisition [Member] |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |
Number of development parcels acquired (in parcels) | parcel |  | 2 |  |  |
Undeveloped land suitable for future development (in acres) | a |  | 9 |  |  |
Purchase price of acquisition |  | $ 50,600 |  |  |
2018 Dispositions [Member] |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |
Purchase price of real estate | 34,000 |  |  |  |
Gains on disposition of property | $ 17,000 |  |  |  |

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