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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Summary of Financial Position of Real Estate Ventures (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Net property | $ 834,367 | $ 835,983 |
Other assets | 342,002 | 159,499 |
Other liabilities | 290,071 | 85,681 |
Debt, net | 585,068 | 365,707 |
Equity | 301,230 | 544,094 |
Right of use asset - operating leases, net | 21,656 | 0 | $ 0
Lease Liability - operating leases | 22,554 | 0 |
MAP Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net property | 192,582 | 198,043 |
Other assets | 256,453 | 65,465 |
Other liabilities | 266,200 | 59,348 |
Debt, net | 181,525 | 180,555 |
Equity | 1,310 | 23,605 |
Right of use asset - operating leases, net | 197,100 |  |
Lease Liability - operating leases | 206,400 |  |
Brandywine-AI Ventures LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net property | 24,651 | 47,043 |
Other assets | 3,000 | 11,206 |
Other liabilities | 824 | 2,002 |
Debt, net | 0 | 26,020 |
Equity | 26,827 | 30,227 |
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Net property | 617,134 | 590,897 |
Other assets | 82,549 | 82,828 |
Other liabilities | 23,047 | 24,331 |
Debt, net | 403,543 | 159,132 |
Equity | $ 273,093 | $ 490,262 |

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