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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | $ 118,408 |  | $ 120,294
Equity in loss of real estate ventures | (1,891) | $ (1,358) |
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 17,602 |  | 17,524
Equity in loss of real estate ventures | 78 | 78 |
Metropolitan Washington, D.C. |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 102,396 |  | 102,840
Equity in loss of real estate ventures | (449) | (175) |
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | (1,590) |  | (70)
Equity in loss of real estate ventures | (1,520) | (1,367) |
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 0 |  | $ 0
Equity in loss of real estate ventures | $ 0 | $ 106 |

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