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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures |  | $ 128,189 |  | $ 128,189 |  | $ 169,100
Equity in income (loss) of real estate venture |  | (1,491) | $ (358) | (2,849) | $ (1,183) |
Philadelphia CBD [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures |  | 18,759 |  | 18,759 |  | 19,897
Equity in income (loss) of real estate venture |  | 84 | 89 | 162 | (147) |
Metropolitan DC [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures | [1] | 104,384 |  | 104,384 |  | 136,142
Equity in income (loss) of real estate venture | [1] | (260) | (363) | (435) | (400) |
MAP Venture [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures | [2] | 3,242 |  | 3,242 |  | 11,173
Equity in income (loss) of real estate venture | [2] | (1,445) | (830) | (2,812) | (1,567) |
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures |  | 1,804 |  | 1,804 |  | 1,888
Equity in income (loss) of real estate venture |  | 130 | 93 | 236 | 197 |
Austin, Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures | [3] | 0 |  | 0 |  | $ 0
Equity in income (loss) of real estate venture | [3] | $ 0 | $ 653 | $ 0 | $ 734 |
[1] | On December 20, 2018, the Company formed the Herndon Innovation Center Venture. See footnote (c) to the “Net operating income” table above for further information regarding this transaction.
[2] | Formed on February 4, 2016, represents a joint venture between the Company and MAP Ground Lease Holdings LLC, an affiliate of Och-Ziff Capital Management Group, LLC, on February 4, 2016. The 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 Company’s investment in MAP Venture is separately presented. All other unconsolidated real estate ventures are managed consistently with the Company’s regional segments.
[3] | On December 11, 2018, the Company acquired from DRA Advisors, an unaffiliated third party, DRA’s 50% ownership interest in the G&I Austin Office LLC real estate venture. The DRA Austin Venture owned twelve office properties containing an aggregate 1,570,123 square feet, located in Austin, Texas. As a result of the acquisition, the Company acquired complete ownership of the Austin properties.

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