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Partners Equity of the Operating Partnership (Textual) (Details) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 10, 2019	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2019
Earnings Per Common Partnership Unit [Line Items]
Dividends, common stock	$ 33,800,000
Shares repurchased and retired (in shares)				1,337,169
Share price (in dollars per share)				$ 12.92
Value of stock repurchased and retired		$ 0	$ 17,281,000	$ 17,300,000
Dividend declared
Earnings Per Common Partnership Unit [Line Items]
Dividends payable (in dollars per share)	$ 0.19
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Earnings Per Common Partnership Unit [Line Items]
Dividends, common stock	$ 33,800,000
Repurchase program, number of mirror unit of operating partnership retired for each common share repurchased				1
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Dividend declared
Earnings Per Common Partnership Unit [Line Items]
Dividends payable (in dollars per share)	$ 0.19

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