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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Real Estate Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of results of operations of Real Estate Ventures      
Income (Loss) from Equity Method Investments $ (790)us-gaap_IncomeLossFromEquityMethodInvestments $ 3,664us-gaap_IncomeLossFromEquityMethodInvestments $ 2,741us-gaap_IncomeLossFromEquityMethodInvestments
Unconsolidated real estate ventures [Member]      
Summary of results of operations of Real Estate Ventures      
Revenue 147,236us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
102,919us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
164,013us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Operating expenses (61,268)bdn_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(40,436)bdn_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(70,775)bdn_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Interest expense, net (36,511)bdn_EquityMethodInvestmentSummarizedFinancialInformationInterestExpenseNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(26,529)bdn_EquityMethodInvestmentSummarizedFinancialInformationInterestExpenseNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(41,633)bdn_EquityMethodInvestmentSummarizedFinancialInformationInterestExpenseNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Depreciation and amortization (57,109)bdn_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(35,138)bdn_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(50,241)bdn_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Net income (7,652)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
816us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
1,364us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Income (Loss) from Equity Method Investments $ (790)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
$ 3,664us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
$ 2,741us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember