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Summary of Significant Accounting Policies (Notes Receivable) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1 10.00%us-gaap_ConcentrationRiskPercentage1 10.00%us-gaap_ConcentrationRiskPercentage1
Capitalized interest $ 4,800,000us-gaap_InterestCostsCapitalized $ 2,600,000us-gaap_InterestCostsCapitalized $ 2,600,000us-gaap_InterestCostsCapitalized
Interest Income 3,974,000us-gaap_InterestIncomeOther 1,044,000us-gaap_InterestIncomeOther 3,008,000us-gaap_InterestIncomeOther
Notes receivable 88,000,000us-gaap_NotesReceivableNet 7,026,000us-gaap_NotesReceivableNet  
Accrued Rent Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Doubtful Accounts Receivable 13,400,000us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_AccruedRentReceivableMember
13,000,000us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_AccruedRentReceivableMember
 
River Place [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest Income 700,000us-gaap_InterestIncomeOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_RiverPlaceMember
   
Notes receivable 88,000,000us-gaap_NotesReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_RiverPlaceMember
   
Accounts receivable and accrued rent receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_AccountsreceivableandaccruedrentreceivableMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_AccountsreceivableandaccruedrentreceivableMember
 
20 Year Amortization Period [Member] | Purchase money mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable   7,000,000us-gaap_NotesReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_PurchaseMoneyMortgageMember
/ bdn_NotesReceivableByMaturityAxis
= bdn_TwentyYearAmortizationPeriodMember
 
Mortgage Loans on Real Estate, Interest Rate   8.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_PurchaseMoneyMortgageMember
/ bdn_NotesReceivableByMaturityAxis
= bdn_TwentyYearAmortizationPeriodMember
 
Notes Receivable Amortization Period, Years 20 years 20 years  
20 Year Amortization Period [Member] | Accrued interest received [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest Income 1,500,000us-gaap_InterestIncomeOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bdn_AccruedinterestreceivedMember
/ bdn_NotesReceivableByMaturityAxis
= bdn_TwentyYearAmortizationPeriodMember
   
Trenton Properties [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest Income 1,000,000us-gaap_InterestIncomeOther
/ us-gaap_RealEstatePropertiesAxis
= bdn_TrentonPropertiesMember
   
Number of properties sold     2bdn_NumberOfPropertiesSold
/ us-gaap_RealEstatePropertiesAxis
= bdn_TrentonPropertiesMember
Gross deferred gain on sale of properties     12,900,000us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_RealEstatePropertiesAxis
= bdn_TrentonPropertiesMember
Equity Method Investments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Capitalized interest $ 2,000,000us-gaap_InterestCostsCapitalized
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityMethodInvestmentsMember
$ 600,000us-gaap_InterestCostsCapitalized
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityMethodInvestmentsMember