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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | $ 167,782 |  | $ 167,782 |  | $ 194,621
Equity in income (loss) of real estate venture |  | 1 | $ (5,723) | (1,182) | $ (5,387) |
Philadelphia CBD [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 20,544 |  | 20,544 |  | 39,939
Equity in income (loss) of real estate venture |  | (36) | 134 | (183) | 113 |
Pennsylvania Suburbs [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 0 |  | 0 |  | 3,503
Equity in income (loss) of real estate venture |  | 0 | 24 | 0 | 448 |
Metropolitan DC [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 119,032 |  | 119,032 |  | 119,817
Equity in income (loss) of real estate venture |  | (31) | (5,264) | (431) | (4,872) |
Austin, Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 14,411 |  | 14,411 |  | 13,973
Equity in income (loss) of real estate venture |  | 423 | (15) | 1,156 | 1,266 |
MAP Venture [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity | [1] | 11,939 |  | 11,939 |  | 15,450
Equity in income (loss) of real estate venture | [1] | (444) | (706) | (2,011) | (2,610) |
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 1,856 |  | 1,856 |  | $ 1,939
Equity in income (loss) of real estate venture |  | $ 89 | $ 104 | $ 287 | $ 268 |
[1] | The MAP Venture represents a joint venture, formed on February 4, 2016 between the Company and MAP Ground Lease Holdings LLC, an affiliate of Och-Ziff Capital Management Group, LLC. The MAP Venture’s business operations, including properties in Richmond, Virginia; Metropolitan Washington, D.C.; New Jersey/Delaware and Pennsylvania Suburbs, are centrally managed with the results reported to management of the Company on a consolidated basis. As a result, the investment in the MAP Venture is separately presented. All other unconsolidated real estate ventures are managed consistently with the Company’s regional segments.

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