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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ 1,324,157 $ 1,633,334 $ 1,701,219
Change in fair market value during year 3,200 (4,579) 5,371
Allocation of unrealized (gains)/losses on derivative financial instruments to noncontrolling interests (11) 14 (18)
Amortization of interest rate contracts reclassified from comprehensive income to interest expense [1] 0 0 564
Ending balance 1,044,587 1,324,157 1,633,334
Operating Partnership      
Change in fair market value during year 3,200 (4,579) 5,371
Amortization of interest rate contracts reclassified from comprehensive income to interest expense [1] 0 0 564
BRANDYWINE OPERATING PARTNERSHIP, L.P.      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Change in fair market value during year 3,200 (4,579) 5,371
Amortization of interest rate contracts reclassified from comprehensive income to interest expense [1] 0 0 564
Operating Partnership      
Beginning balance 1,321,372 1,630,139 1,690,079
Change in fair market value during year 3,200 (4,579) 5,371
Amortization of interest rate contracts reclassified from comprehensive income to interest expense [1] 0 0 564
Ending balance 1,041,717 1,321,372 1,630,139
Accumulated Other Comprehensive Income (Loss)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (668) 3,897 (2,020)
Ending balance 2,521 (668) 3,897
Accumulated Other Comprehensive Income (Loss) | BRANDYWINE OPERATING PARTNERSHIP, L.P.      
Operating Partnership      
Beginning balance (1,010) 3,569 (2,366)
Ending balance $ 2,190 $ (1,010) $ 3,569
[1] Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.