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PARTNERS' EQUITY OF THE PARENT COMPANY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 24, 2024
Sep. 25, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Common Partnership Unit [Line Items]                    
Distributions declared (in dollars per share)     $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.19 $ 0.19    
Amount of dividend declared   $ 26.3                
Repurchased and retired (in shares)                 0 0
Subsequent Event                    
Earnings Per Common Partnership Unit [Line Items]                    
Dividends paid in cash (in dollars per share) $ 0.15                  
BRANDYWINE OPERATING PARTNERSHIP, L.P.                    
Earnings Per Common Partnership Unit [Line Items]                    
Distributions declared (in dollars per share)     $ 0.15              
Amount of dividend declared   $ 0.1                
Repurchase program, ratio of mirror unit of operating partnership retired for each common share repurchased                 1  
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Subsequent Event                    
Earnings Per Common Partnership Unit [Line Items]                    
Dividends paid in cash (in dollars per share) $ 0.15