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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Investment in joint venture | $ 415,823 |  | $ 389,811
Equity in loss of real estate ventures | (6,924) | $ (1,891) |
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in joint venture | 300,694 |  | 268,562
Equity in loss of real estate ventures | (4,279) | 78 |
Metropolitan Washington, D.C. |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in joint venture | 99,617 |  | 99,769
Equity in loss of real estate ventures | (417) | (449) |
Mid-Atlantic Office Joint Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in joint venture | 32,735 |  | 32,996
Equity in loss of real estate ventures | 207 | 0 |
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in joint venture | (17,223) |  | $ (11,516)
Equity in loss of real estate ventures | $ (2,435) | $ (1,520) |

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