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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Company's estimates of fair value differ from the carrying amounts    
Unsecured Notes Payable, Carrying Amount $ 1,518,382bdn_UnsecuredNotesPayableNetOfDiscountsCarryingAmount $ 1,518,108bdn_UnsecuredNotesPayableNetOfDiscountsCarryingAmount
Variable Rate Debt, Carrying Amount 278,610bdn_VariableRateDebtInstrumentsCarryingAmount 278,610bdn_VariableRateDebtInstrumentsCarryingAmount
Mortgage notes payable, Carrying Amount 650,545us-gaap_SecuredDebt 654,590us-gaap_SecuredDebt
Notes Receivable, Carrying Amount 0us-gaap_NotesReceivableGross [1] 88,000us-gaap_NotesReceivableGross [1]
Unsecured Notes Payable, Fair Value 1,584,451bdn_UnsecuredNotesPayableNetOfDiscountsFairValue 1,593,212bdn_UnsecuredNotesPayableNetOfDiscountsFairValue
Variable Rate Debt, Fair Value 257,512bdn_VariableRateDebtInstrumentsFairValue 257,188bdn_VariableRateDebtInstrumentsFairValue
Mortgage notes payable, Fair Value 695,228bdn_SecuredDebtPrincipalBalanceOutstandingFairValueDisclosure 707,241bdn_SecuredDebtPrincipalBalanceOutstandingFairValueDisclosure
Notes Receivable, Fair Value $ 0us-gaap_NotesReceivableFairValueDisclosure [1] $ 87,692us-gaap_NotesReceivableFairValueDisclosure [1]
[1] On January 30, 2015 the mortgage note was repaid. For further information regarding the mortgage note, see Note 2, "Summary of Significant Accounting Policies," included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014