Consolidated Statements of Partners' Equity - USD ($) $ in Thousands	Total	BRANDYWINE OPERATING PARTNERSHIP, L.P.	General Partner Capital [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Series E-linked Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.
Beginning Balance at Dec. 31, 2014		$ 2,134,755	$ 2,041,902	$ 96,850		$ (5,007)		$ 1,010
Beginning Balance, Shares at Dec. 31, 2014			179,293,160	4,000,000
Net income	$ 11,652	11,652	$ 11,655				$ 60	(3)
Other comprehensive loss	(1,053)	(1,053)			$ (1,044)	(1,051)	(9)	(2)
Share Issuance from/to Deferred Compensation Plan	0
Share Issuance from/to Deferred Compensation Plan, Shares			86,839
Issuance of partnership interest in consolidated real estate venture		1,025						1,025
Bonus share issuance	125	125	$ 125
Bonus share issuance, Shares			8,447
Equity issuance costs	(48)	(48)	$ (48)
Share-based compensation activity	2,955	2,955	$ 2,955
Share-based compensation activity, Shares			509,675
Adjustment of redeemable partnership units to liquidation value at period end		1,383	$ 1,383
Distribution to preferred shareholders	(3,450)	(3,450)	(3,450)
Distributions to general partnership unitholders		(54,265)	(54,265)
Ending Balance at Jun. 30, 2015		2,093,079	$ 2,000,257	$ 96,850		(6,058)		2,030
Ending Balance, Shares at Jun. 30, 2015			179,898,121	4,000,000
Beginning Balance at Dec. 31, 2015		1,929,977	$ 1,836,692	$ 96,850		(5,597)		2,032
Beginning Balance, Shares at Dec. 31, 2015			174,688,568	4,000,000
Net income	44,987	44,987	$ 44,981				367	6
Other comprehensive loss	(12,686)	(12,686)			$ (12,577)	(12,686)	(109)
Share Issuance from/to Deferred Compensation Plan	(46)	(46)	$ (46)
Share Issuance from/to Deferred Compensation Plan, Shares			(8,252)
Issuance of partnership interest in consolidated real estate venture	54	54					54	54
Conversion of LP Units to Common Shares	0	875	$ 875				$ (875)
Conversion of LP Units to Common Shares, Shares			55,303
Share-based compensation activity	3,615	3,615	$ 3,615
Share-based compensation activity, Shares			365,414
Adjustment of redeemable partnership units to liquidation value at period end		(2,450)	$ (2,450)
Redemption value of limited partnership units		(875)	(875)
Distribution to preferred shareholders	$ (3,450)	(3,450)	(3,450)
Distributions to general partnership unitholders		(54,272)	(54,272)
Ending Balance at Jun. 30, 2016		$ 1,905,729	$ 1,825,070	$ 96,850		$ (18,283)		$ 2,092
Ending Balance, Shares at Jun. 30, 2016			175,101,033	4,000,000