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Summary of Significant Accounting Policies Construction in Progress (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Construction in Progress [Line Items] |  |  |
Internal direct construction costs capitalized related to development of properties and land holdings | $ 5,200,000 bdn_InternalDirectConstructionCostsCapitalizedRelatedToDevelopmentOfPropertiesAndLandHoldings | $ 3,700,000 bdn_InternalDirectConstructionCostsCapitalizedRelatedToDevelopmentOfPropertiesAndLandHoldings | $ 4,700,000 bdn_InternalDirectConstructionCostsCapitalizedRelatedToDevelopmentOfPropertiesAndLandHoldings
Capitalized interest | 4,800,000 us-gaap_InterestCostsCapitalized | 2,600,000 us-gaap_InterestCostsCapitalized | 2,600,000 us-gaap_InterestCostsCapitalized
Salaries including bonuses and benefits, capitalized during the period | 5,194,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod | 3,673,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod | 4,669,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod
Development [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries including bonuses and benefits, capitalized during the period | 1,749,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressDevelopmentMember | 156,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressDevelopmentMember | 57,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressDevelopmentMember
Redevelopment [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries including bonuses and benefits, capitalized during the period | 184,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressRedevelopmentMember | 194,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressRedevelopmentMember | 353,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressRedevelopmentMember
Tenant Improvements [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries including bonuses and benefits, capitalized during the period | $ 3,261,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressTenantImprovementsMember | $ 3,323,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressTenantImprovementsMember | $ 4,259,000 bdn_SalariesIncludingBonusesAndBenefitsCapitalizedDuringPeriod / bdn_ConstructionInProgressAxis = bdn_ConstructionInProgressTenantImprovementsMember

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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