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v2.4.1.9

Debt Obligations (Details Textuals 2) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 16, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |
Long Term Debt Maturities Repayments Of Principal |  | $ 2,459,463,000 bdn_LongTermDebtMaturitiesRepaymentsOfPrincipal |  |
Extinguishment of Debt, Amount |  | 376,174,000 us-gaap_ExtinguishmentOfDebtAmount | 29,250,000 us-gaap_ExtinguishmentOfDebtAmount | 164,968,000 us-gaap_ExtinguishmentOfDebtAmount
Amortization of Financing Costs |  | 5,148,000 us-gaap_AmortizationOfFinancingCosts | 4,676,000 us-gaap_AmortizationOfFinancingCosts | 6,208,000 us-gaap_AmortizationOfFinancingCosts
Derivative, Gain (Loss) on Derivative, Net | (800,000)us-gaap_DerivativeGainLossOnDerivativeNet | (828,000)us-gaap_DerivativeGainLossOnDerivativeNet | 0 us-gaap_DerivativeGainLossOnDerivativeNet | (2,985,000)us-gaap_DerivativeGainLossOnDerivativeNet
Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 0.29%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Long-term Debt, Gross |  | 1,803,529,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 1,929,703,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Debt [Member] | Three Year Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_ThreeYearTermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 150,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_ThreeYearTermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Debt [Member] | Four-Year Term Loan - Variable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_FourYearTermLoanVariableMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 100,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_FourYearTermLoanVariableMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Debt [Member] | Seven Year Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Declining prepayment penalty in year three |  | 1.00%bdn_DecliningPrepaymentPenaltyAfterThreeYears / us-gaap_DebtInstrumentAxis = bdn_SevenYearTermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Derivative, Average Fixed Interest Rate |  | 3.623%us-gaap_DerivativeAverageFixedInterestRate / us-gaap_DebtInstrumentAxis = bdn_SevenYearTermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Long-term Debt, Gross |  | 200,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_SevenYearTermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 200,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_SevenYearTermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Debt [Member] | Note 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | 250,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_Note2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 250,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_Note2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Debt [Member] | Note Five [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_NoteFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 157,625,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_NoteFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Extinguishment of Debt, Amount | 42,700,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = bdn_NoteFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |
Unsecured Debt [Member] | Note Six [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  | 149,919,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_NoteSixMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 149,919,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = bdn_NoteSixMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Debt [Member] | Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Letters of Credit Outstanding, Amount |  | 4,300,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Unsecured Debt [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 595,700,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  | 5.72%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 5.73%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 6.65%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember
Long-term Debt, Gross |  | 655,934,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 669,762,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |
Note Six [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 510,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember | $ 99,571,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember

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- Definition Declining Prepayment Penalty After Three Years + References No definition available. + Details
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- Definition Long term-debt maturities repayments of principal + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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