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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | $ 169,100 | $ 194,621 | $ 281,331
Equity in loss of Real Estate Ventures |  | (15,231) | (8,306) | (11,503)
Philadelphia CBD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | 19,897 | 39,939 | 48,691
Equity in loss of Real Estate Ventures |  | (105) | 255 | (686)
Pennsylvania Suburbs [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | 0 | 3,503 | 15,421
Equity in loss of Real Estate Ventures |  | 0 | 631 | 748
Metropolitan DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity | [1] | 136,142 | 119,817 | 141,786
Equity in loss of Real Estate Ventures | [1] | (15,065) | (5,044) | (6,293)
MAP Venture [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity | [2] | 11,173 | 15,450 | 20,893
Equity in loss of Real Estate Ventures | [2] | (2,155) | (3,443) | (4,218)
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity |  | 1,888 | 1,939 | 1,654
Equity in loss of Real Estate Ventures |  | 407 | 285 | 814
Austin, Texas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Investment in real estate ventures, at equity | [3] | 0 | 13,973 | 52,886
Equity in loss of Real Estate Ventures | [3] | $ 1,687 | $ (990) | $ (1,868)
[1] | On December 20, 2018, the Company formed a joint venture with Rockpoint. See footnote (a) to the “Real estate investments, at cost” table above for further information regarding this transaction.
[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.
[3] | See footnote (b) to the “Real estate investments, at cost” table above for further information regarding this transaction.

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