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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | $ 552,494 | $ 532,224 |
Equity in income (loss) of real estate venture | (77,915) | (22,016) | $ (26,697)
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 450,136 | 387,301 |
Equity in income (loss) of real estate venture | (25,793) | (11,764) | (15,191)
Mid-Atlantic Office JV |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 0 | 31,005 |
Equity in income (loss) of real estate venture | (26,448) | 412 | 932
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | (48,733) | (35,411) |
Equity in income (loss) of real estate venture | (10,581) | (8,340) | (8,683)
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 79,160 | 65,426 |
Equity in income (loss) of real estate venture | 0 | 0 | 0
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in real estate ventures, at equity | 71,931 | 83,903 |
Equity in income (loss) of real estate venture | $ (15,093) | $ (2,324) | $ (3,755)

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