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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 113,055 |  | $ 113,055 |  | $ 120,294
Equity in loss of real estate ventures | (2,203) | $ (1,491) | (4,094) | $ (2,849) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 16,611 |  | 16,611 |  | 17,524
Equity in loss of real estate ventures | 83 | 84 | 161 | 162 |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 101,947 |  | 101,947 |  | 102,840
Equity in loss of real estate ventures | (647) | (260) | (1,096) | (435) |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | (5,503) |  | (5,503) |  | (70)
Equity in loss of real estate ventures | (1,639) | (1,445) | (3,159) | (2,812) |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 0 |  | 0 |  | $ 0
Equity in loss of real estate ventures | $ 0 | $ 130 | $ 0 | $ 236 |

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