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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  | $ 1,633,334 | $ 1,701,219 | $ 1,804,648
Change in fair market value during year |  | (4,579) | 5,371 | 4,817
Allocation of unrealized (gains)/losses on derivative financial instruments to noncontrolling interests |  | 14 | (18) | (28)
Amortization of interest rate contracts reclassified from comprehensive income to interest expense | [1] | 0 | 564 | 752
Ending balance |  | 1,324,157 | 1,633,334 | 1,701,219
Operating Partnership |  |  |  |
Change in fair market value during year |  | (4,579) | 5,371 | 4,817
Amortization of interest rate contracts reclassified from comprehensive income to interest expense | [1] | 0 | 564 | 752
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Change in fair market value during year |  | (4,579) | 5,371 | 4,817
Amortization of interest rate contracts reclassified from comprehensive income to interest expense | [1] | 0 | 564 | 752
Operating Partnership |  |  |  |
Beginning balance |  | 1,630,139 | 1,690,079 | 1,793,082
Change in fair market value during year |  | (4,579) | 5,371 | 4,817
Amortization of interest rate contracts reclassified from comprehensive income to interest expense | [1] | 0 | 564 | 752
Ending balance |  | 1,321,372 | 1,630,139 | 1,690,079
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning balance |  | 3,897 | (2,020) | (7,561)
Ending balance |  | (668) | 3,897 | (2,020)
Accumulated Other Comprehensive Income (Loss) | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |
Operating Partnership |  |  |  |
Beginning balance |  | 3,569 | (2,366) | (7,935)
Ending balance |  | $ (1,010) | $ 3,569 | $ (2,366)
[1] | Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.

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- Definition Amount, after tax, of adjustments from accumulated other comprehensive income (AOCI) for gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (dd) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A + Details
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