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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | $ 589,195 |  | $ 589,195 |  | $ 532,224
Equity in income (loss) of real estate venture | (7,598) | $ (4,981) | (13,765) | $ (9,544) |
Philadelphia CBD |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 452,365 |  | 452,365 |  | 387,301
Equity in income (loss) of real estate venture | (4,412) | (2,574) |  |  |
Metropolitan Washington, D.C. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 82,603 |  | 82,603 |  | 83,903
Equity in income (loss) of real estate venture | (1,414) | (381) |  |  |
Mid-Atlantic Office JV |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 28,791 |  | 28,791 |  | 31,005
Equity in income (loss) of real estate venture | 223 | (101) |  |  |
MAP Venture |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | (41,310) |  | (41,310) |  | (35,411)
Equity in income (loss) of real estate venture | (1,995) | (1,925) |  |  |
Austin, Texas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Investment in real estate ventures | 66,746 |  | $ 66,746 |  | $ 65,426
Equity in income (loss) of real estate venture | $ 0 | $ 0 |  |  |

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