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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Assets Held for Sale |  |  |
Total Assets Held for Sale | $ 4,151 | $ 9,046 |
Liabilities Held for Sale |  |  |
Total Liabilities Held for Sale | 0 | 114 |
Real Estate Held For Sale |  |  |
Assets Held for Sale |  |  |
Real estate, at cost | 3,173 | 12,997 | $ 11,500
Less: accumulated depreciation | 218 | 3,970 | $ 2,700
Total real estate held for sale, net | 2,955 | 9,027 |
Lease intangibles, net | 1,105 | 9 |
Deferred rent receivable, net | 91 | 10 |
Total Assets Held for Sale | 4,151 | 9,046 |
Liabilities Held for Sale |  |  |
Asset retirement obligation | 0 | 114 |
Total Liabilities Held for Sale | $ 0 | $ 114 |

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