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Real Estate Dispositions, Held for Sale and Impairment Charges (Tables) | 9 Months Ended
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Sep. 30, 2018
Real Estate [Abstract] |
Summary of Sold Properties | During the nine months ended September 30, 2018, we sold two non-core properties, located in Arlington, Texas and Tewksbury, Massachusetts, which are 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
166,200 |  |  | $ | 11,100 |  |  | $ | 327 |  |  | $ | 1,844 |
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 three and nine months ended September 30, 2018, and 2017 (dollars in thousands):
|  | For the three months ended September 30, |  | For the nine months ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Operating revenue |  | $ | — |  |  | $ | 173 |  |  | $ | 93 |  |  | $ | 698 |
Operating expense |  | — |  |  | 212 |  |  | 161 |  |  | 528 |
Other income, net |  | — |  |  | — |  |  | 1,844 |  | (1) | — |
(Expense) income from real estate and related assets sold |  | $ | — |  |  | $ | (39 | ) |  | $ | 1,776 |  |  | $ | 170 |
(1) | Includes a $1.8 million gain on sale of real estate, net on two properties.
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 condensed consolidated balance sheets (dollars in thousands):
| September 30, 2018 |  | December 31, 2017
Assets Held for Sale |  |  |
Real estate, at cost | $ | 2,287 |  |  | $ | 12,997 |
Less: accumulated depreciation | 857 |  |  | 3,970 |
Total real estate held for sale, net | 1,430 |  |  | 9,027 |
Lease intangibles, net | 6 |  |  | 9 |
Deferred rent receivable, net | — |  |  | 10 |
Total Assets Held for Sale | $ | 1,436 |  |  | $ | 9,046 |
Liabilities Held for Sale |  |  |
Asset retirement obligation | $ | 297 |  |  | $ | 114 |
Total Liabilities Held for Sale | $ | 297 |  |  | $ | 114 |

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- Definition Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109226691&loc=SL51724579-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1474-107760 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5D -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721677-107760 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721659-107760 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721671-107760 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721663-107760 + Details
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