Partners Equity of the Operating Partnership (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator
Income (Loss) from continuing operations, Basic	$ 20,308	$ 8,885	$ 31,960	$ 7,893
Income (Loss) from continuing operations, Diluted	20,308	8,885	31,960	7,893
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(76)	(82)	(253)	(268)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(76)	(82)	(253)	(268)
Preferred share/unit dividends, Basic	(1,725)	(1,725)	(5,175)	(5,175)
Preferred share/unit dividends, Diluted	(1,725)	(1,725)	(5,175)	(5,175)
Income (loss) from discontinued operations, Basic	$ 0	$ (3)	$ 0	$ 918
Denominator
Weighted-average units outstanding, Basic (in shares)	178,188,037	171,606,722	179,198,714	161,866,955
Contingent securities/Share based compensation (in shares)	588,647	1,587,148	789,778	1,487,015
Diluted weighted average shares outstanding (in shares)	178,776,684	173,193,870	179,988,492	163,353,970
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.10	$ 0.04	$ 0.15	$ 0.01
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	0.10	0.04	0.15	0.01
Discontinued operations attributable to common shareholders, Basic (USD per share)	0.00	0.00	0.00	0.01
Discontinued operations attributable to common shareholders, Diluted (USD per share)	0.00	0.00	0.00	0.01
Net income (loss) attributable to common shareholders, Basic (USD per share)	0.10	0.04	0.15	0.02
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.10	$ 0.04	$ 0.15	$ 0.02
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Numerator
Income (Loss) from continuing operations, Basic	$ 20,308	$ 8,885	$ 31,960	$ 7,893
Income (Loss) from continuing operations, Diluted	20,308	8,885	31,960	7,893
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(76)	(82)	(253)	(268)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(76)	(82)	(253)	(268)
Preferred share/unit dividends, Basic	(1,725)	(1,725)	(5,175)	(5,175)
Preferred share/unit dividends, Diluted	(1,725)	(1,725)	(5,175)	(5,175)
Net loss attributable to non-controlling interests, Basic	(1)	(24)	4	(12)
Net loss attributable to non-controlling interests, Diluted	(1)	(24)	4	(12)
Net income from continuing operations available to common unitholders, Basic	18,506	7,054	26,536	2,438
Net income from continuing operations available to common unitholders, Diluted	18,506	7,054	26,536	2,438
Income (loss) from discontinued operations, Basic	0	(3)	0	918
Income (loss) from discontinued operations, diluted	0	(3)	0	918
Net income attributable to common unitholders, Basic	18,506	7,051	26,536	3,356
Net income attributable to common unitholders, Diluted	$ 18,506	$ 7,051	$ 26,536	$ 3,356
Denominator
Weighted-average units outstanding, Basic (in shares)	179,723,139	173,341,782	180,733,816	163,620,963
Contingent securities/Share based compensation (in shares)	588,647	1,587,148	789,778	1,487,015
Diluted weighted average shares outstanding (in shares)	180,311,786	174,928,930	181,523,594	165,107,978
Earnings per Common Partnership Unit:
Income (loss) from continuing operations attributable to common shareholders, Basic (USD per share)	$ 0.10	$ 0.04	$ 0.15	$ 0.01
Income (loss) from continuing operations attributable to common shareholders, Dilued (USD per share)	0.10	0.04	0.15	0.01
Discontinued operations attributable to common shareholders, Basic (USD per share)	0.00	0.00	0.00	0.01
Discontinued operations attributable to common shareholders, Diluted (USD per share)	0.00	0.00	0.00	0.01
Net income (loss) attributable to common shareholders, Basic (USD per share)	0.10	0.04	0.15	0.02
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ 0.10	$ 0.04	$ 0.15	$ 0.02