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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Summary of Results of Operations of Real Estate Ventures with Interests (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in income (loss) of Real Estate Ventures | $ (9,922) | $ (15,231) | $ (8,306)
DRA Austin Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenue |  | 53,476 | 85,500
Operating expenses |  | (22,994) | (35,997)
Provision for impairment |  | 0 |
Interest expense, net |  | (9,083) | (13,985)
Depreciation and amortization |  | (19,226) | (34,026)
Loss on extinguishment of debt |  | (356) | (2,613)
Net income (loss) |  | $ 1,817 | $ (1,121)
Ownership percentage |  | 50.00% | 50.00%
Company's share of net income (loss) |  | $ 909 | $ (560)
Other-than-temporary impairment |  | 0 | 0
Basis adjustments and other |  | 778 | (429)
Equity in income (loss) of Real Estate Ventures |  | 1,687 | (989)
MAP Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenue | 70,366 | 68,622 | 68,573
Operating expenses | (47,362) | (41,056) | (40,035)
Provision for impairment | 0 | 0 |
Interest expense, net | (9,752) | (12,690) | (13,677)
Depreciation and amortization | (25,413) | (18,891) | (21,202)
Loss on extinguishment of debt | 0 | (334) | 0
Net income (loss) | $ (12,161) | $ (4,349) | $ (6,341)
Ownership percentage | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) | $ (6,081) | $ (2,175) | $ (3,171)
Other-than-temporary impairment |  | 0 | 0
Basis adjustments and other | (21) | 20 | (272)
Equity in income (loss) of Real Estate Ventures | (6,102) | (2,155) | (3,443)
Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenue | 6,022 | 23,515 | 29,500
Operating expenses | (2,912) | (10,483) | (12,298)
Provision for impairment | (5,664) | (20,832) |
Interest expense, net | (698) | (3,478) | (4,707)
Depreciation and amortization | (2,514) | (8,991) | (11,428)
Loss on extinguishment of debt | 0 | (695) | (811)
Net income (loss) | $ (5,766) | $ (20,964) | $ 256
Ownership percentage | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) | $ (2,883) | $ (10,482) | $ 128
Other-than-temporary impairment |  | (4,076) | (4,844)
Basis adjustments and other | 83 | (1) | 251
Equity in income (loss) of Real Estate Ventures | $ (2,800) | (14,559) | (4,465)
Evo at Cira Centre South Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenue |  | 163 | 12,285
Operating expenses |  | (256) | (3,075)
Provision for impairment |  | 0 |
Interest expense, net |  | (123) | (4,092)
Depreciation and amortization |  | (409) | (4,512)
Loss on extinguishment of debt |  | 0 | 0
Net income (loss) |  | $ (625) | $ 606
Ownership percentage | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) |  | $ (313) | $ 303
Other-than-temporary impairment |  | 0 | 0
Basis adjustments and other |  | (45) | 146
Equity in income (loss) of Real Estate Ventures | $ 0 | (358) | 449
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenue | 55,970 | 19,550 | 20,413
Operating expenses | (21,510) | (7,246) | (7,935)
Provision for impairment | 0 | 0 |
Interest expense, net | (11,458) | (4,400) | (3,752)
Depreciation and amortization | (25,404) | (6,309) | (7,272)
Loss on extinguishment of debt | (1,231) | 0 | 0
Net income (loss) | (3,633) | 1,595 | 1,454
Company's share of net income (loss) | (901) | 137 | 1,436
Other-than-temporary impairment |  | 0 | 0
Basis adjustments and other | (119) | 17 | (1,294)
Equity in income (loss) of Real Estate Ventures | (1,020) | 154 | 142
Unconsolidated Real Estate Ventures |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenue | 132,358 | 165,326 | 216,271
Operating expenses | (71,784) | (82,035) | (99,340)
Provision for impairment | (5,664) | (20,832) |
Interest expense, net | (21,908) | (29,774) | (40,213)
Depreciation and amortization | (53,331) | (53,826) | (78,440)
Loss on extinguishment of debt | (1,231) | (1,385) | (3,424)
Net income (loss) | (21,560) | (22,526) | (5,146)
Company's share of net income (loss) | (9,865) | (11,924) | (1,864)
Other-than-temporary impairment |  | (4,076) | (4,844)
Basis adjustments and other | (57) | 769 | (1,598)
Equity in income (loss) of Real Estate Ventures | $ (9,922) | $ (15,231) | $ (8,306)

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