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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Commerce Square Venture (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 21, 2020 | Jul. 21, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Sale of ownership interest percentage |  | 60.00% |  |
Outstanding indebtedness | $ 1,830,595 |  |  | $ 2,144,418
Secured Debt |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Outstanding indebtedness | $ 0 |  |  | $ 313,812
Philadelphia Office | Secured Debt |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Outstanding indebtedness |  |  | $ 222,100 |
Commerce Square |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Sale of ownership interest percentage |  |  | 30.00% |
Commerce Square |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 70.00% |  |  |
Commerce Square | Preferred Equity Securities |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 32.00% |  |  |
Commerce Square | Common Equity Securities |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 38.00% |  |  |

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