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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | $ 434,555 |  | $ 411,110
Equity in income (loss) of real estate venture | (4,563) | $ (6,924) |
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 343,502 |  | 317,959
Equity in income (loss) of real estate venture | (2,772) | (4,279) |
Metropolitan Washington, D.C. |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 85,976 |  | 85,867
Equity in income (loss) of real estate venture | (186) | (417) |
Mid-Atlantic Office JV |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | 31,911 |  | 31,680
Equity in income (loss) of real estate venture | 418 | 207 |
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures | (26,834) |  | $ (24,396)
Equity in income (loss) of real estate venture | $ (2,023) | $ (2,435) |

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