Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Real estate investments:
Operating properties	$ 4,689,892	$ 4,669,289
Accumulated depreciation	(1,045,016)	(983,808)
Operating real estate investments, net	3,644,876	3,685,481
Construction-in-progress	92,713	74,174
Land inventory	90,266	93,351
Total real estate investments, net	3,827,855	3,853,006
Cash and cash equivalents	234,836	263,207
Accounts receivable, net	21,622	17,389
Accrued rent receivable, net	131,280	126,295
Investment in real estate ventures, at equity	186,042	180,512
Deferred costs, net	123,592	122,954
Intangible assets, net	112,140	132,329
Other assets	66,806	69,403
Total assets	4,704,173	4,765,095
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	662,478	670,151
Unsecured term loans	450,000	450,000
Unsecured senior notes, net of discounts	1,475,772	1,475,230
Accounts payable and accrued expenses	83,114	83,693
Distributions payable	25,588	25,584
Deferred income, gains and rent	70,519	71,635
Acquired lease intangibles, net	29,116	34,444
Other liabilities	37,144	32,923
Total liabilities	2,833,731	2,843,660
Commitments and contingencies (Note 16)
Equity:
6.90% Series E Preferred Shares/Units, $0.01 par value; issued and outstanding- 4,000,000 in 2014 and 2013	40	40
Common Shares of Brandywine Realty Trust’s beneficial interest, $0.01 par value; shares authorized 400,000,000; 157,090,983 and 156,731,993 issued and outstanding in 2014 and 2013, respectively	1,571	1,566
Additional paid-in capital	2,975,070	2,971,596
Deferred compensation payable in common shares	6,303	5,407
Common shares in grantor trust, 387,087 in 2014 and 312,280 in 2013	(6,303)	(5,407)
Cumulative earnings	522,520	522,528
Accumulated other comprehensive loss	(6,105)	(2,995)
Cumulative distributions	1,643,241	1,592,515
Total equity, excluding non-controlling interest	1,849,855	1,900,220
Non-controlling interests	20,587	21,215
Total beneficiaries' equity	1,870,442	1,921,435
Total liabilities and beneficiaries' equity	4,704,173	4,765,095
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	4,689,892	4,669,289
Accumulated depreciation	(1,045,016)	(983,808)
Operating real estate investments, net	3,644,876	3,685,481
Construction-in-progress	92,713	74,174
Land inventory	90,266	93,351
Total real estate investments, net	3,827,855	3,853,006
Cash and cash equivalents	234,836	263,207
Accounts receivable, net	21,622	17,389
Accrued rent receivable, net	131,280	126,295
Investment in real estate ventures, at equity	186,042	180,512
Deferred costs, net	123,592	122,954
Intangible assets, net	112,140	132,329
Other assets	66,806	69,403
Total assets	4,704,173	4,765,095
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	662,478	670,151
Unsecured term loans	450,000	450,000
Unsecured senior notes, net of discounts	1,475,772	1,475,230
Accounts payable and accrued expenses	83,114	83,693
Distributions payable	25,588	25,584
Deferred income, gains and rent	70,519	71,635
Acquired lease intangibles, net	29,116	34,444
Other liabilities	37,144	32,923
Total liabilities	2,833,731	2,843,660
Commitments and contingencies (Note 16)
Redeemable limited partnership units at redemption value;
Redeemable limited partnership units at redemption value; 1,763,739 issued and outstanding in 2014 and 2013, respectively	27,211	26,486
Equity:
6.90% Series E Preferred Shares/Units, $0.01 par value; issued and outstanding- 4,000,000 in 2014 and 2013	96,850	96,850
General Partnership Capital, 157,090,983 and 156,731,993 units issued and outstanding in 2014 and 2013, respectively	1,751,968	1,800,530
Accumulated other comprehensive loss	(6,522)	(3,377)
Total equity, excluding non-controlling interest	1,842,296	1,894,003
Non-controlling interests	935	946
Total beneficiaries' equity	1,843,231	1,894,949
Total liabilities and beneficiaries' equity	$ 4,704,173	$ 4,765,095