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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | $ 389,811 | $ 120,294 |
Equity in loss of Real Estate Ventures | (18,584) | (9,922) | $ (15,231)
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 268,562 | 17,524 |
Equity in loss of Real Estate Ventures | (9,090) | 328 | (105)
Metropolitan DC |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 99,769 | 102,840 |
Equity in loss of Real Estate Ventures | (3,019) | (4,234) | (15,065)
Mid-Atlantic Office JV |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 32,996 | 0 |
Equity in loss of Real Estate Ventures | 96 | 0 | 0
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | (11,516) | (70) |
Equity in loss of Real Estate Ventures | (6,571) | (6,102) | (2,155)
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 0 | 0 |
Equity in loss of Real Estate Ventures | 0 | 86 | 407
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 0 | 0 |
Equity in loss of Real Estate Ventures | $ 0 | $ 0 | $ 1,687

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