XML 93 R78.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments and Contingencies (Textual) (Details) |  |  |  |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 23, 2018 | May 18, 2018 | Jul. 01, 2016 USD ($) a | Dec. 03, 2015 ft² | Apr. 02, 2015 USD ($) | Sep. 30, 2018 USD ($) Parcel | Mar. 16, 2018 a | Oct. 13, 2017 USD ($) | Apr. 28, 2017 a | Jan. 30, 2017 a
Subaru Build-to-Service Center Project [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Lease terms |  |  |  | 18 years |  |  |  |  |  |
Rentable Square Feet | ft² |  |  |  | 83,000 |  |  |  |  |  |
Purchase option of lease from inception period | 5 years |  |  | 5 years |  |  |  |  |  |
Estimated project costs |  |  |  |  |  | $ 47,600,000 |  |  |  |
Developer profit percentage |  | 8.00% |  |  |  |  |  |  |  |
Period following substantial completion of project to determine closing date |  | 30 days |  |  |  |  |  |  |  |
Period following completion of punch list items to determine closing date |  | 3 days |  |  |  |  |  |  |  |
Subaru Build-to-Service Center Project [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Project costs funded |  |  |  |  |  | 34,500,000 |  |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Real estate ventures aggregate indebtedness |  |  |  |  |  | 664,200,000 |  |  |  |
PJP VII [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  |  |  | 400,000 |  |  |  |
Real estate property debt |  |  |  |  |  | 4,200,000 |  |  |  |
4040 Wilson Venture [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  |  |  | 41,300,000 |  |  |  |
Loan total borrowing capacity |  |  |  |  |  | 150,000,000.0 |  |  |  |
618 Market Street [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration, liability |  |  |  |  | $ 2,000,000.0 | 1,900,000 |  |  |  |
Fair value of contingent consideration |  |  |  |  | 1,600,000 |  |  |  |  |
Interest expense |  |  |  |  | $ 2,000,000.0 |  |  |  |  |
One Drexel Plaza [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Expected excess redevelopment funding |  |  |  |  |  | 37,300,000 |  |  |  |
Estimated aggregate cost |  |  |  |  |  | 83,100,000 |  |  |  |
Acquisition cost, inclusive in estimated aggregate cost |  |  |  |  |  |  |  | $ 37,800,000 |  |
Schuylkill Yards [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Required spending in capital improvements to property |  |  |  |  |  | 2,700,000 |  |  |  |
Estimated potential additional contribution obligation |  |  |  |  |  | $ 700,000 |  |  |  |
Garza Land Acquisition [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Acreage of land | a |  |  | 34.6 |  |  |  |  |  |  |
Gross purchase value of assets |  |  | $ 20,600,000 |  |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  |  |  | 3 |  |  |  |
Garza Land Acquisition [Member] | Parcel One [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Area of land sold | a |  |  |  |  |  |  |  |  | 8.4 |
Garza Land Acquisition [Member] | Parcel Two [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Area of land sold | a |  |  |  |  |  |  |  |  |  | 1.7
Garza Land Acquisition [Member] | Parcel Three [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Area of land sold | a |  |  |  |  |  |  | 6.6 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Lease terms |  |  |  |  |  | 10 years |  |  |  |
Minimum [Member] | One Drexel Plaza [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Required spending in capital improvements to property |  |  |  |  |  | $ 8,000,000.0 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Lease terms |  |  |  |  |  | 66 years |  |  |  |
Mortgage Lenders [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Associated letter of credit |  |  |  |  |  | $ 0 |  |  |  |

X
- Definition Area of land acquired. + References No definition available. + Details
Name: | bdn_AreaOfLandAcquired
Namespace Prefix: | bdn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of land sold + References No definition available. + Details
Name: | bdn_AreaOfLandSold
Namespace Prefix: | bdn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt instrument, maximum borrowing capacity. + References No definition available. + Details
Name: | bdn_DebtInstrumentMaximumBorrowingCapacity
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Developer profit percentage. + References No definition available. + Details
Name: | bdn_DeveloperProfitPercentage
Namespace Prefix: | bdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity method investment summarized financial information debt. + References No definition available. + Details
Name: | bdn_EquityMethodInvestmentSummarizedFinancialInformationDebt
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated potential additional contribution obligation. + References No definition available. + Details
Name: | bdn_EstimatedPotentialAdditionalContributionObligation
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated project costs. + References No definition available. + Details
Name: | bdn_EstimatedProjectCosts
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated redevelopment costs. + References No definition available. + Details
Name: | bdn_EstimatedRedevelopmentCosts
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Excess estimated ground lease funding. + References No definition available. + Details
Name: | bdn_ExcessEstimatedGroundLeaseFunding
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of parcels sold. + References No definition available. + Details
Name: | bdn_NumberOfParcelsSold
Namespace Prefix: | bdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Payments to acquire real estate gross. + References No definition available. + Details
Name: | bdn_PaymentsToAcquireRealEstateGross
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period following completion of punch list items to determine closing date. + References No definition available. + Details
Name: | bdn_PeriodFollowingCompletionOfPunchListItemsToDetermineClosingDate
Namespace Prefix: | bdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period following substantial completion of the project to determine closing date. + References No definition available. + Details
Name: | bdn_PeriodFollowingSubstantialCompletionOfProjectToDetermineClosingDate
Namespace Prefix: | bdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Project costs funded. + References No definition available. + Details
Name: | bdn_ProjectCostsFunded
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Purchase option of lease from inception period. + References No definition available. + Details
Name: | bdn_PurchaseOptionOfLeaseFromInceptionPeriod
Namespace Prefix: | bdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net rentable area for properties owned. + References No definition available. + Details
Name: | us-gaap_NetRentableArea
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bdn_SubaruBuildToServiceCenterProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_UnconsolidatedRealEstateVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_PJPVIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=bdn_A4040WilsonVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bdn_A618MarketStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bdn_OneDrexelPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bdn_SchuylkillYardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bdn_GarzaLandAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bdn_LandParcelOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bdn_LandParcelTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bdn_LandParcelThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |