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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | $ 236,313 |  | $ 236,313 |  | $ 281,331
Equity in income (loss) of real estate ventures |  | (5,723) | $ (7,254) | (5,387) | $ (9,323) |
Philadelphia CBD [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 42,298 |  | 42,298 |  | 48,691
Equity in income (loss) of real estate ventures |  | 134 | (453) | 113 | (473) |
Pennsylvania Suburbs [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 3,320 |  | 3,320 |  | 15,421
Equity in income (loss) of real estate ventures |  | 24 | (170) | 448 | 410 |
Metropolitan DC [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity | [1] | 119,550 |  | 119,550 |  | 141,786
Equity in income (loss) of real estate ventures | [1] | (5,264) | (5,287) | (4,872) | (6,068) |
Austin, Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 52,940 |  | 52,940 |  | 52,886
Equity in income (loss) of real estate ventures |  | (15) | (561) | 1,266 | (1,299) |
MAP Venture [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity | [2] | 16,283 |  | 16,283 |  | 20,893
Equity in income (loss) of real estate ventures | [2] | (706) | (1,010) | (2,610) | (2,608) |
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 1,922 |  | 1,922 |  | $ 1,654
Equity in income (loss) of real estate ventures |  | $ 104 | $ 227 | $ 268 | $ 715 |
[1] | The three- and nine-month periods ended September 30, 2017 include a $4.8 million other than temporary impairment charge related to the BDN - AI Venture that was recorded during the three months ended September 30, 2017.
[2] | The MAP Venture represents a joint venture formed between the Company and MAP Ground Lease Holdings LLC, an affiliate of Och-Ziff Capital Management Group, LLC, on February 4, 2016. 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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