XML 105 R77.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Investment in Unconsolidated Ventures - Investment in Real Estate Ventures and Share of Real Estate Ventures' Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 30, 2015 | May. 29, 2015 | Jan. 20, 2011
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 0.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 241,004 |  | $ 225,004 |  | $ 180,512 |  |  |
Equity Method Investments including net liabilities |  | 239,874 |  | 223,790 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (811) |  | (790) |  | $ 3,664 |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 794,571 |  | 965,077 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 0.00% |  |  |  |  |  |  |
Brandywine - Al Venture [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 50.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 50,760 |  | 45,712 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (229) |  | (185) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 132,717 |  | 133,843 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.94% |  |  |  |  |  |  |
Austin Joint Venture [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1],[2] | 50.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [2] | $ 60,427 |  | 40,374 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [2] | (1,235) |  | (574) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [2] | $ 410,066 |  | 382,100 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [2] | 3.38% |  |  |  |  |  |  |
One Thousand Chesterbrook Blvd. [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 50.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 1,895 |  | 2,152 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 117 |  | 388 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 23,610 |  | 24,251 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 4.75% |  |  |  |  |  |  |
Four Tower Bridge [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 65.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 1,684 |  | 1,474 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 211 |  | (144) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 10,162 |  | 10,353 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 5.20% |  |  |  |  |  |  |
PJP VII [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 25.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 872 |  | 911 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 211 |  | 177 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 5,621 |  | 5,785 |  |  |  |  |
Debt Instrument, Interest Rate Terms |  | 0 |  |  |  |  |  |  |
PJP Two [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 30.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 435 |  | 403 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 32 |  | 73 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 3,201 |  | 3,492 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 6.12% |  |  |  |  |  |  |
PJP Five [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 25.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 305 |  | 216 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 189 |  | 166 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 5,035 |  | 5,242 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 6.47% |  |  |  |  |  |  |
PJP Six [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 25.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 45 |  | 45 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 151 |  | (67) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 7,918 |  | 8,168 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 6.08% |  |  |  |  |  |  |
Invesco, L.P. [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1],[3] | 0.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [3] | $ 0 |  | 0 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [3] | 349 |  | 989 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [3] | $ 0 |  | 0 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [3] | 0.00% |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms | [3] | 0 |  |  |  |  |  |  |
Broadmoor Austin Associates [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1],[3] | 0.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [3] | $ 0 |  | 65,407 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [3] | (377) |  | (460) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [3] | $ 0 |  | 53,516 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [3] | 0.00% |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms | [3] | 0 |  |  |  |  |  |  |
GI Interchange Office LLC (DRA — N. PA) [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1],[3] | 0.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [3] | $ 0 |  | 0 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [3] | 0 |  | (658) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [3] | $ 0 |  | 174,595 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [3] | 0.00% |  |  |  |  |  |  |
Coppell Associates [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1],[4] | 50.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [4] | $ (1,130) |  | (1,214) |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [4] | 84 |  | (45) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [4] | $ 15,515 |  | 15,747 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [4] | 5.75% |  |  |  |  |  |  |
HSRE, LLC [Member] [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1],[2] | 30.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | [2] | $ 15,003 |  | 14,314 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [2] | (188) |  | 67 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [2] | $ 95,562 |  | 90,245 |  |  |  |  |
Debt Instrument, Interest Rate Terms | [2] | 0 |  |  |  |  |  |  |
4040 Wilson Venture [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 50.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 36,626 |  | 27,415 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (106) |  | (132) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 0 |  | 0 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 0.00% |  |  |  |  |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 50.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 12,338 |  | 12,720 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (252) |  | (83) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 50,964 |  | 29,481 |  |  |  |  |
Debt Instrument, Interest Rate Terms |  | 0 |  |  |  |  |  |  |
Residence Inn Tower Bridge [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 0.00% | [1],[3] |  |  |  | 50.00% |  |
Investment in Real Estate Ventures, at equity |  | $ 0 | [3] | 723 | [3] |  | $ 900 |  |
Company’s share of income (loss) (Company’s basis) | [3] | 367 |  | 107 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [3] | $ 0 |  | 13,394 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [3] | 0.00% |  |  |  |  |  |  |
Debt Instrument, Interest Rate Terms | [3] | 0 |  |  |  |  |  |  |
Brandywine Nineteen Nineteen Ventures [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% | [1],[2],[5] |  |  |  |  |  | 50.00%
Investment in Real Estate Ventures, at equity | [2],[5] | $ 29,086 |  | 12,823 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) | [2],[5] | 0 |  | (21) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt | [2],[5] | $ 19,411 |  | 0 |  |  |  |  |
Debt Instrument, Interest Rate Terms | [2],[5] | 0 |  |  |  |  |  |  |
51 N 50 Patterson [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 70.00% | [1] |  |  |  |  | 70.00% |
Investment in Real Estate Ventures, at equity |  | $ 16,725 |  | 0 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 0 |  | 0 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 0 |  | 0 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 0.00% |  |  |  |  |  |  |
1250 First Street Office [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 70.00% | [1] |  |  |  |  | 70.00% |
Investment in Real Estate Ventures, at equity |  | $ 14,312 |  | 0 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | 0 |  | 0 |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 0 |  | 0 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 0.00% |  |  |  |  |  |  |
Seven Tower Bridge [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1] | 20.00% |  |  |  |  |  |  |
Investment in Real Estate Ventures, at equity |  | $ 491 |  | 315 |  |  |  |  |
Company’s share of income (loss) (Company’s basis) |  | (135) |  | (388) |  |  |  |  |
Equity Method Investment Summarized Financial Information Debt |  | $ 14,789 |  | $ 14,865 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.44% |  |  |  |  |  |  |
[1] | Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.
[2] | The basis differences associated with these ventures are allocated between cost and the underlying equity in the net assets of the investee and is accounted for as if the entity were consolidated (i.e., allocated to the Company’s relative share of assets and liabilities with an adjustment to recognize equity in earnings for the appropriate depreciation/amortization).
[3] | The ownership interest in Invesco, L.P. was sold prior to December 31, 2014. The Company purchased the remaining 50% interest in Broadmoor Austin Associates on June 22, 2015. The ownership interest in DRA-N. PA was disposed of on August 12, 2015. The ownership interest in Residence Inn Tower Bridge was sold on December 30, 2015. See below for further detail on 2015 dispositions.
[4] | Carrying amount represents the negative investment balance of the venture and is included in other liabilities.
[5] | The stated rate for the construction loan is LIBOR + 2.25%. The interest rate spread decreases to 2.00% upon receipt of certificate of occupancy. It is further reduced to 1.75% upon stabilization. To fulfill interest rate protection requirements an interest rate cap was purchased at 4.50%.

X
- Definition Equity Method Investment Summarized Financial Information Other Liabilities. + References No definition available. + Details
Name: | bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 Equity Method Investments including net liabilities + References No definition available. + Details
Name: | bdn_EquityMethodInvestmentsincludingnetliabilities
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_BrandywineAlVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_AustinJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_OneThousandChesterbrookBlvdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_FourTowerBridgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_PjpTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_PjpFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_PjpSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_InvescoLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_BroadmoorAustinAssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_GIInterchangeOfficeLLCDRANPAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_CoppellAssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_HsreLlcMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_TBBDNPlymouthApartmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_ResidenceInnTowerBridgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_BrandywineNineteenNineteenVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_A51N50PattersonHoldingsLLCVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_A1250FirstStreetOfficeLLCVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_SevenTowerBridgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |