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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Company’s share of income (Company’s basis) $ 131us-gaap_IncomeLossFromEquityMethodInvestments $ 242us-gaap_IncomeLossFromEquityMethodInvestments
Unconsolidated Real Estate Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Revenue 46,109us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
34,385us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Operating expenses (18,533)bdn_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(13,982)bdn_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Interest expense, net (9,846)bdn_EquityMethodInvestmentSummarizedFinancialInformationInterestExpenseNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(8,100)bdn_EquityMethodInvestmentSummarizedFinancialInformationInterestExpenseNet
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Depreciation and amortization (19,124)bdn_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(13,598)bdn_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Net loss (1,394)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
(1,295)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
Company’s share of income (Company’s basis) $ 131us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember
$ 242us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_CorporateJointVentureMember