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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 127,759 |  | $ 127,759 |  | $ 169,100
Equity in (loss) income of Real Estate Ventures | (1,965) | $ 1 | (4,814) | $ (1,182) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 18,114 |  | 18,114 |  | 19,897
Equity in (loss) income of Real Estate Ventures | 55 | (36) | 217 | (183) |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 106,111 |  | 106,111 |  | 136,142
Equity in (loss) income of Real Estate Ventures | (528) | (31) | (963) | (431) |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 1,620 |  | 1,620 |  | 11,173
Equity in (loss) income of Real Estate Ventures | (1,602) | (444) | (4,414) | (2,011) |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 1,914 |  | 1,914 |  | 1,888
Equity in (loss) income of Real Estate Ventures | 110 | 89 | 346 | 287 |
Austin, Texas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 0 |  | 0 |  | $ 0
Equity in (loss) income of Real Estate Ventures | $ 0 | $ 423 | $ 0 | $ 1,156 |

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