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REAL ESTATE INVESTMENTS - Summary of Acquired Properties (Details) $ in Thousands |  |  |  | 12 Months Ended
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Nov. 30, 2020 USD ($) ft² | Nov. 05, 2020 USD ($) ft² | Feb. 27, 2020 USD ($) a | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase Price (a) |  |  |  | $ 41,950 | $ 0 | $ 196,625
Land | 145 King of Prussia Road |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acres | a |  |  | 7.75 |  |  |
Office Properties | 145 King of Prussia Road |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase Price (a) |  |  | $ 11,250 |  |  |
Office Properties | 1505-11 Race Street |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Rentable square feet | ft² |  | 119,763 |  |  |  |
Purchase Price (a) |  | $ 9,700 |  |  |  |
Office Properties | 250 King of Prussia Road (b) |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Rentable square feet | ft² | 169,843 |  |  |  |  |
Purchase Price (a) | $ 20,250 |  |  |  |  |

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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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