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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 680,136 |  | $ 680,136 |  | $ 552,494
Equity in income (loss) of real estate ventures | (14,507) | $ (7,598) | (28,095) | $ (13,765) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 501,579 |  | 501,579 |  | 450,136
Equity in income (loss) of real estate ventures | (10,223) | (4,412) |  |  |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 94,834 |  | 94,834 |  | 71,931
Equity in income (loss) of real estate ventures | (941) | (1,414) |  |  |
Mid-Atlantic Office JV |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 0 |  | 0 |  | 0
Equity in income (loss) of real estate ventures | 0 | 223 |  |  |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 0 |  | 0 |  | (48,733)
Equity in income (loss) of real estate ventures | (3,339) | (1,995) |  |  |
Austin, Texas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 83,723 |  | $ 83,723 |  | $ 79,160
Equity in income (loss) of real estate ventures | $ (4) | $ 0 |  |  |

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