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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in joint venture | $ 422,333 |  | $ 422,333 |  | $ 389,811
Equity in loss of real estate ventures | (7,240) | $ (2,203) | (14,164) | $ (4,094) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in joint venture | 310,237 |  | 310,237 |  | 268,562
Equity in loss of real estate ventures | (4,661) | 83 | (8,940) | 161 |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in joint venture | 98,839 |  | 98,839 |  | 99,769
Equity in loss of real estate ventures | (778) | (647) | (1,195) | (1,096) |
Mid-Atlantic Office Joint Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in joint venture | 32,388 |  | 32,388 |  | 32,996
Equity in loss of real estate ventures | 117 | 0 | 324 | 0 |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in joint venture | (19,131) |  | (19,131) |  | $ (11,516)
Equity in loss of real estate ventures | $ (1,918) | $ (1,639) | $ (4,353) | $ (3,159) |

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