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SEGMENT INFORMATION - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | $ 120,294 | $ 169,100 | $ 194,621
Equity in loss of Real Estate Ventures | (9,922) | (15,231) | (8,306)
Philadelphia CBD |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 17,524 | 19,897 | 39,939
Equity in loss of Real Estate Ventures | 328 | (105) | 255
Pennsylvania Suburbs |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 0 | 0 | 3,503
Equity in loss of Real Estate Ventures | 0 | 0 | 631
Metropolitan DC |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 102,840 | 136,142 | 119,817
Equity in loss of Real Estate Ventures | (4,234) | (15,065) | (5,044)
MAP Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | (70) | 11,173 | 15,450
Equity in loss of Real Estate Ventures | (6,102) | (2,155) | (3,443)
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 0 | 1,888 | 1,939
Equity in loss of Real Estate Ventures | 86 | 407 | 285
Austin, Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | 0 | 0 | 13,973
Equity in loss of Real Estate Ventures | $ 0 | $ 1,687 | $ (990)

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