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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | $ 532,224 | $ 411,110 |
Equity in income (loss) of real estate venture | (22,016) | (26,697) | $ (18,584)
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 387,301 | 317,959 |
Equity in income (loss) of real estate venture | (11,764) | (15,191) | (9,090)
Metropolitan Washington, D.C. |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 83,903 | 85,867 |
Equity in income (loss) of real estate venture | (2,324) | (3,755) | (3,019)
Mid-Atlantic Office Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 31,005 | 31,680 |
Equity in income (loss) of real estate venture | 412 | 932 | 96
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | (35,411) | (24,396) |
Equity in income (loss) of real estate venture | (8,340) | (8,683) | (6,571)
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 65,426 | 0 |
Equity in income (loss) of real estate venture | $ 0 | $ 0 | $ 0

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