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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - PJP Ventures (Details) $ in Thousands |  | 12 Months Ended
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Oct. 29, 2019 USD ($) ft² property | Dec. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Area of real estate property | ft² |  | 13,852,464 |  |
Proceeds from the sale of properties |  | $ 278,114 | $ 41,795 | $ 324,090
Net gain on real estate venture transactions |  | $ 75 | $ 11,639 | $ 142,233
Charlottesville VA | PJP II, PJP VII, And PJP VII |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of properties contributed to a joint venture | property | 3 |  |  |
Area of real estate property | ft² | 204,347 |  |  |
Sales price | $ 51,000 |  |  |
Proceeds from the sale of properties | 9,100 |  |  |
Net gain on real estate venture transactions | $ 8,000 |  |  |
Minimum | Charlottesville VA | PJP II, PJP VII, And PJP VII |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 25.00% |  |  |
Maximum | Charlottesville VA | PJP II, PJP VII, And PJP VII |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 30.00% |  |  |

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