Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Proceeds from Issuance of Common Stock	$ 0	$ 8,069
Proceeds from Issuance of Preferred Stock and Preference Stock	96,240	0
Supplemental disclosure:
Capitalized interest	1,207	859
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Proceeds from Issuance of Common Stock	0	8,069
Proceeds from Issuance of Preferred Stock and Preference Stock	96,240	0
Supplemental disclosure:
Capitalized interest	$ 1,207	$ 859