XML 38 R61.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Debt Obligations (Details Textuals 2) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 Bank Term Loan And The Credit Facility [Member] Federal Funds Rate [Member] | Sep. 30, 2011 Unsecured Debt [Member] | Sep. 30, 2012 Unsecured Debt [Member] Seven Year Term Loan [Member] | Sep. 30, 2012 Unsecured Debt [Member] Three and Four Year Term Loan [Member] | Sep. 30, 2012 Secured Debt [Member] | Sep. 30, 2011 Secured Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  | 0.98% |  |  | 6.72% | 6.83%
Line of Credit Facility, Interest Rate During Period |  | 0.95% |  |  |  |
Declining prepayment penalty in year one |  |  | 3.00% |  |  |
Declining prepayment penalty in year two |  |  | 2.00% |  |  |
Declining prepayment penalty in year three |  |  | 1.00% |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  | 1.90% |  |  |
Derivative, Average Fixed Interest Rate |  |  | 3.623% |  |  |
Notional amount of interest rate cash flow hedge derivatives |  |  |  | $ 300.0 |  |
Derivative, lower fixed interest rate range |  |  |  | 2.47% |  |
Derivative, higher fixed interest rate range |  |  |  | 2.91% |  |
Derivative, lower remaining maturity range |  |  |  | 3 years |  |
Derivative, higher remaining maturity range |  |  |  | 5 years |  |

X
- Definition Declining prepayment penalty in Year One + References No definition available. + Details
Name: | bdn_DecliningPrepaymentPenaltyInYearOne
Namespace Prefix: | bdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Declining prepayment penalty in Year Three + References No definition available. + Details
Name: | bdn_DecliningPrepaymentPenaltyInYearThree
Namespace Prefix: | bdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Declining prepayment penalty in Year Two + References No definition available. + Details
Name: | bdn_DecliningPrepaymentPenaltyInYearTwo
Namespace Prefix: | bdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition High end of the range of fixed interest rates when a range is presented for a group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeHigherFixedInterestRateRange
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeHigherRemainingMaturityRange1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Low end of the range of fixed interest rates when a range is presented for a group of interest rate derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeLowerFixedInterestRateRange
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Low end period remaining until maturity of derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeLowerRemainingMaturityRange1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
Name: | us-gaap_NotionalAmountOfInterestRateCashFlowHedgeDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant