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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 | $ 965,077 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt |  |  |
Company's share of equity (Company's basis) | 225,004 us-gaap_EquityMethodInvestments | 180,512 us-gaap_EquityMethodInvestments | 193,555 us-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 | 3,492 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_PjpTwoMember |  |  |
Company's share of equity (Company's basis) | 403 us-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 | 15,747 bdn_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 | 1,281,282 bdn_EquityMethodInvestmentSummarizedFinancialInformationNetProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember | 965,475 bdn_EquityMethodInvestmentSummarizedFinancialInformationNetProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  |
Other Assets | 195,121 bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember | 164,152 bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  |
Other Liabilities | 68,481 bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember | 49,442 bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  |
Equity Method Investment Summarized Financial Information Debt | 965,077 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember | 699,860 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  |
Equity | 442,845 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember | 380,325 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember |  |
Company's share of equity (Company's basis) | 225,004 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_CorporateJointVentureMember | 180,512 us-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 | 5,242 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_PjpFiveMember |  |  |
Company's share of equity (Company's basis) | 216 us-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 | 382,100 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  | 34,500 bdn_EquityMethodInvestmentSummarizedfinancialinformationdebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember
Company's share of equity (Company's basis) | $ 40,374 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bdn_AustinJointVentureMember |  |  |

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