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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 367,771 |  | $ 367,771 |  | $ 120,294
Equity in loss of real estate ventures | (5,788) | $ (1,965) | (9,882) | $ (4,814) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 277,161 |  | 277,161 |  | 17,524
Equity in loss of real estate ventures | (2,737) | 55 | (2,575) | 217 |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 100,325 |  | 100,325 |  | 102,840
Equity in loss of real estate ventures | (1,367) | (528) | (2,463) | (963) |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | (9,715) |  | (9,715) |  | (70)
Equity in loss of real estate ventures | (1,684) | (1,602) | (4,844) | (4,414) |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 0 |  | 0 |  | $ 0
Equity in loss of real estate ventures | $ 0 | $ 110 | $ 0 | $ 346 |

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