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REAL ESTATE INVESTMENTS - Narratives (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 29, 2022 USD ($) | Jul. 14, 2022 USD ($) ft² | Sep. 30, 2022 USD ($) ft² | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) ft² | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Net gain on disposition of real estate |  |  | $ 8,669 | $ 0 | $ 8,813 | $ 142 |
Rentable Square Feet | ft² |  |  | 13,664,209 |  | 13,664,209 |  |
Investment in real estate ventures |  |  | $ 546,935 |  | $ 546,935 |  | $ 411,110
3151 Market Street | Land |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Rentable Square Feet | ft² |  | 500,000 |  |  |  |  |
3151 Market Street | Leasehold Interest |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Net gain on disposition of real estate |  | $ 2,583 |  |  |  |  |
Lease agreement term |  | 99 years |  |  |  |  |
11501 Burnet Road | Land |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Net gain on disposition of real estate | $ 8,312 |  |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Net gain on disposition of real estate |  |  | $ 8,669 | $ 0 | $ 8,813 | $ 142 |

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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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