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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | $ 171,383 |  | $ 194,621
Equity in income (loss) of real estate ventures |  | (825) | $ (748) |
Philadelphia CBD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | 21,641 |  | 39,939
Equity in income (loss) of real estate ventures |  | (236) | (67) |
Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | 0 |  | 3,503
Equity in income (loss) of real estate ventures |  | 0 | 276 |
Metropolitan DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | 120,041 |  | 119,817
Equity in income (loss) of real estate ventures |  | (37) | 467 |
Austin, Texas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | 14,069 |  | 15,450
Equity in income (loss) of real estate ventures |  | 80 | (1,117) |
MAP Venture [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity | [1] | 13,713 |  | 1,939
Equity in income (loss) of real estate ventures | [1] | (736) | 58 |
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | 1,919 |  | $ 13,973
Equity in income (loss) of real estate ventures |  | $ 104 | $ (365) |
[1] | 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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