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Real Estate Dispositions, Held for Sale, and Impairment Charges - Components of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Assets Held for Sale |  |  |
Total Assets Held for Sale | $ 9,046 | $ 9,562 |
Liabilities Held for Sale |  |  |
Total Liabilities Held for Sale | 114 | 1,041 |
Real Estate Held For Sale |  |  |
Assets Held for Sale |  |  |
Real estate, at cost | 12,997 | 11,454 | $ 1,900
Less: accumulated depreciation | 3,970 | 2,668 | $ 800
Total real estate held for sale, net | 9,027 | 8,786 |
Lease intangibles, net | 9 | 200 |
Deferred rent receivable, net | 10 | 575 |
Other assets | 0 | 1 |
Total Assets Held for Sale | 9,046 | 9,562 |
Liabilities Held for Sale |  |  |
Deferred rent liability, net | 0 | 755 |
Asset retirement obligation | 114 | 286 |
Total Liabilities Held for Sale | $ 114 | $ 1,041 |

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