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Real Estate Dispositions, Held for Sale, and Impairment Charges (Tables) | 12 Months Ended
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Dec. 31, 2018
Real Estate [Abstract] |
Summary Properties Sold | During the year ended December 31, 2018, we sold three non-core properties, located in Arlington, Texas, Tewksbury, Massachusetts, and South Hadley, Massachusetts, respectively, and applied the proceeds towards outstanding debt and property acquisitions, which is summarized in the table below (dollars in thousands):
Aggregate Square Footage Sold |  | Aggregate Sales Price |  | Aggregate Sales Costs |  | Aggregate Gain on Sale of Real Estate, net
316,200 |  |  | $ | 13,400 |  |  | $ | 565 |  |  | $ | 2,763 |
Components of Operating Income from Real Estate and Related Assets Disposed | The table below summarizes the components of operating income from the real estate and related assets disposed of during the years ended December 31, 2018, 2017, and 2016, respectively (dollars in thousands):
|  | For the year ended December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Operating revenue |  | $ | 383 |  |  | $ | 1,160 |  |  | $ | 1,403 |  |
Operating expense |  | 311 |  |  | 3,705 |  | (2) | 1,849 |  | (3)
Other income, net |  | 2,763 |  | (1) | — |  |  | (158 | ) |
(Expense) income from real estate and related assets sold |  | $ | 2,835 |  |  | $ | (2,545 | ) |  | $ | (604 | ) |
(1) Includes $2.8 million gain on sale of real estate, net. (2) Includes $2.8 million impairment charge. (3) Includes $1.1 million impairment charge.
Components of Income from Real Estate and Related Assets Held for Sale | The table below summarizes the components of income from real estate and related assets held for sale at December 31, 2018 (dollars in thousands):
|  | For the year ended December 31,
|  | 2018 |  | 2017 |  | 2016
Operating revenue |  | $ | 1,007 |  |  | $ | 416 |  |  | $ | — |
Operating expense |  | 1,004 |  |  | 471 |  |  | — |
Other income, net |  | (334 | ) |  | (142 | ) |  | — |
(Loss) income from real estate and related assets held for sale |  | $ | (331 | ) |  | $ | (197 | ) |  | $ | — |
Components of Assets and Liabilities Held for Sale | The table below summarizes the components of the assets and liabilities held for sale reflected on the accompanying consolidated balance sheet (dollars in thousands):
|  | December 31, 2018 |  | December 31, 2017
Assets Held for Sale |  |  |  |
Real estate, at cost |  | $ | 3,173 |  |  | $ | 12,997 |
Less: accumulated depreciation |  | 218 |  |  | 3,970 |
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 |  | $ | — |  |  | $ | 114 |
Total Liabilities Held for Sale |  | $ | — |  |  | $ | 114 |

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