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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 31, 2014
Financial position of the Real Estate Ventures        
Equity Method Investment Summarized Financial Information Debt $ 965,077bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt      
Company's share of equity (Company's basis) 225,004us-gaap_EquityMethodInvestments 180,512us-gaap_EquityMethodInvestments 193,555us-gaap_EquityMethodInvestments  
PJP Two [Member]        
Schedule of Equity Method Investments [Line Items]        
Debt Instrument, Maturity Date Nov. 01, 2023      
Financial position of the Real Estate Ventures        
Equity Method Investment Summarized Financial Information Debt 3,492bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_PjpTwoMember
     
Company's share of equity (Company's basis) 403us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_PjpTwoMember
     
Coppell Associates [Member]        
Schedule of Equity Method Investments [Line Items]        
Debt Instrument, Maturity Date Feb. 01, 2016      
Financial position of the Real Estate Ventures        
Equity Method Investment Summarized Financial Information Debt 15,747bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_CoppellAssociatesMember
     
Company's share of equity (Company's basis) (1,214)us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_CoppellAssociatesMember
     
Unconsolidated real estate ventures [Member]        
Financial position of the Real Estate Ventures        
Net property 1,281,282bdn_EquityMethodInvestmentSummarizedFinancialInformationNetProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
965,475bdn_EquityMethodInvestmentSummarizedFinancialInformationNetProperty
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
   
Other Assets 195,121bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
164,152bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
   
Other Liabilities 68,481bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
49,442bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
   
Equity Method Investment Summarized Financial Information Debt 965,077bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
699,860bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
   
Equity 442,845us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
380,325us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
   
Company's share of equity (Company's basis) 225,004us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
180,512us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
   
PJP Five [Member]        
Schedule of Equity Method Investments [Line Items]        
Debt Instrument, Maturity Date Aug. 11, 2019      
Financial position of the Real Estate Ventures        
Equity Method Investment Summarized Financial Information Debt 5,242bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_PjpFiveMember
     
Company's share of equity (Company's basis) 216us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_PjpFiveMember
     
Austin Joint Venture [Member]        
Financial position of the Real Estate Ventures        
Equity Method Investment Summarized Financial Information Debt 382,100bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_AustinJointVentureMember
    34,500bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_AustinJointVentureMember
Company's share of equity (Company's basis) $ 40,374us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bdn_AustinJointVentureMember