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Consolidated Statement of Partners' Equity (USD $) In Thousands, except Share data | Total | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Series E Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P. | Series E-linked Preferred Stock [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P. | General Partner [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P. | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P. | Noncontrolling Interest [Member] | Noncontrolling Interest [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P. | Total partners equity [Member] BRANDYWINE OPERATING PARTNERSHIP, L.P.
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Beginning Balance at Dec. 31, 2011 | $ 1,889,696 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | $ 55,538 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember | $ 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember | $ 1,754,302 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember | $ (6,079)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (6,426)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 33,105 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | $ 1,851,326 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Beginning Balance, shares at Dec. 31, 2011 |  |  | 2,300,000 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember | 0 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember | 142,690,755 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 6,529 us-gaap_ProfitLoss | 6,529 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  | 6,529 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (66)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 6,529 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Comprehensive income (loss) | (10,026)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (10,026)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  | (9,839)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (10,026)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (187)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | (10,026)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Deferred Compensation Obligation Shares |  |  |  |  | (5,564)bdn_DeferredCompensationObligationShares / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Deferred Compensation Obligation |  |  |  |  |  |  |  |  |  | 0 bdn_DeferredCompensationObligation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, New Issues |  |  |  | 4,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | 96,850 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  | 96,850 us-gaap_StockIssuedDuringPeriodValueNewIssues / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember |  |  |  |  |  | 96,850 us-gaap_StockIssuedDuringPeriodValueNewIssues / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Preferred share issuance costs | (613)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts |  |  |  | (613)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (613)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Redemption of preferred shares, Value | (103,448)us-gaap_StockRedeemedOrCalledDuringPeriodValue |  | (55,538)us-gaap_StockRedeemedOrCalledDuringPeriodValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember |  |  |  |  |  |  | (103,450)us-gaap_StockRedeemedOrCalledDuringPeriodValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Redemption of preferred shares, Shares |  |  | (2,300,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember |  |  |  |  |  |  |
Share-based compensation activity | 6,432 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  | 6,432 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 6,432 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, Other |  |  |  |  | 35,703 us-gaap_StockIssuedDuringPeriodSharesOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Bonus share issuance | 387 us-gaap_StockIssuedDuringPeriodValueOther |  |  |  | 387 us-gaap_StockIssuedDuringPeriodValueOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 387 us-gaap_StockIssuedDuringPeriodValueOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  |  |  | 797,375 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Stock Issued During Period, Value, Conversion of Units | (167)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits |  |  |  | (49)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (268)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | (49)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, Conversion of Units |  |  |  |  | 20,464 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Conversion of LP units to cash | (9,741)us-gaap_PartnersCapitalAccountRedemptions |  |  |  | (9,741)us-gaap_PartnersCapitalAccountRedemptions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (5,556)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | (9,741)us-gaap_PartnersCapitalAccountRedemptions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End |  |  |  |  | 9,968 bdn_AdjustmentOfRedeemablePartnershipUnitsToLiquidationValueAtPeriodEnd / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 9,968 bdn_AdjustmentOfRedeemablePartnershipUnitsToLiquidationValueAtPeriodEnd / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Dividends, Preferred Stock, Cash | (10,405)us-gaap_DividendsPreferredStockCash |  |  |  | (10,405)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (10,405)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Preferred share/unit redemption charge | (4,052)us-gaap_RedemptionPremium | (4,052)us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  | (4,052)us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (4,052)us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Partners' Capital Account, Distributions |  |  |  |  | (86,417)us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (86,417)us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Ending Balance at Dec. 31, 2012 | 1,773,516 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember | 96,850 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember | 1,666,341 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember | (15,918)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (16,452)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 21,238 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,746,739 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Ending Balance, shares at Dec. 31, 2012 |  |  | 0 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember | 4,000,000 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember | 143,538,733 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 43,189 us-gaap_ProfitLoss | 43,189 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  | 43,189 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  | 412 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 43,189 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Comprehensive income (loss) | 13,075 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 13,075 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  | 12,923 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 13,075 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 152 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 13,075 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Deferred Compensation Obligation Shares |  |  |  |  | (5,012)bdn_DeferredCompensationObligationShares / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Deferred Compensation Obligation |  |  |  |  |  |  |  |  |  | 0 bdn_DeferredCompensationObligation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Value, New Issues | 182,034 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |  |  |  |
Issuance of LP Units |  |  |  |  | 181,289 bdn_IssuanceOfLpUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 181,289 bdn_IssuanceOfLpUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Issuance of LP Units Shares |  |  |  |  | 12,650,000 bdn_IssuanceOfLpUnitsShares / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Preferred Stock, Shares Issued | 4,000,000 us-gaap_PreferredStockSharesIssued | 4,000,000 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  |
Preferred share issuance costs | (744)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | 946 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination |  |  |  |  |  |  | 946 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 946 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 946 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Share-based compensation activity | 9,438 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  | 9,437 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 9,437 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, Other |  |  |  |  | 27,918 us-gaap_StockIssuedDuringPeriodSharesOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Bonus share issuance | 361 us-gaap_StockIssuedDuringPeriodValueOther |  |  |  | 361 us-gaap_StockIssuedDuringPeriodValueOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 361 us-gaap_StockIssuedDuringPeriodValueOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  |  |  | 438,356 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Stock Issued During Period, Value, Conversion of Units | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits |  |  |  | 1,240 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (1,240)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 1,240 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, Conversion of Units |  |  |  |  | 81,998 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End |  |  |  |  | (778)bdn_AdjustmentOfRedeemablePartnershipUnitsToLiquidationValueAtPeriodEnd / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (778)bdn_AdjustmentOfRedeemablePartnershipUnitsToLiquidationValueAtPeriodEnd / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock |  |  |  |  | (1,240)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (1,240)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Dividends, Preferred Stock, Cash | (6,900)us-gaap_DividendsPreferredStockCash |  |  |  | (6,900)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (6,900)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Preferred share/unit redemption charge | 0 us-gaap_RedemptionPremium | 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  |
Partners' Capital Account, Distributions |  |  |  |  | (92,409)us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (92,409)us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Ending Balance at Dec. 31, 2013 | 1,921,435 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,894,949 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember | 96,850 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember | 1,800,530 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember | (2,995)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (3,377)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 21,215 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 946 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1,894,949 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Ending Balance, shares at Dec. 31, 2013 |  |  | 0 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember | 4,000,000 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember | 156,731,993 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 6,942 us-gaap_ProfitLoss | 6,942 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  | 6,942 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (33)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (44)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 6,898 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Comprehensive income (loss) | (1,630)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (1,630)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  | (1,612)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (1,630)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (18)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | (1,630)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Deferred Compensation Obligation Shares |  |  |  |  | 80,152 bdn_DeferredCompensationObligationShares / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Deferred Compensation Obligation |  |  |  |  | (90)bdn_DeferredCompensationObligation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (90)bdn_DeferredCompensationObligation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, New Issues | 21,850,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | 335,398 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |  |  |  |
Issuance of LP Units |  |  |  |  | 334,903 bdn_IssuanceOfLpUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 334,903 bdn_IssuanceOfLpUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Issuance of LP Units Shares |  |  |  |  | 21,850,000 bdn_IssuanceOfLpUnitsShares / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Preferred Stock, Shares Issued | 4,000,000 us-gaap_PreferredStockSharesIssued | 4,000,000 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  |
Preferred share issuance costs | (495)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts |  |  |  |  |  |  |  |  |
Share-based compensation activity | 6,847 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |  |  |  | 6,847 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 6,847 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  |  |  | 403,902 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Stock Issued During Period, Value, Conversion of Units | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits |  |  |  | 3,614 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  | (3,614)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 3,614 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Stock Issued During Period, Shares, Conversion of Units |  |  |  |  | 228,536 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Share Choice Plan Issuance Shares | 0 bdn_ShareChoicePlanIssuanceShares |  |  |  | (1,423)bdn_ShareChoicePlanIssuanceShares / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 184,116 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  |  |  |
Adjustment of Redeemable Partnership Units to Liquidation Value at Period End |  |  |  |  | 942 bdn_AdjustmentOfRedeemablePartnershipUnitsToLiquidationValueAtPeriodEnd / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | 942 bdn_AdjustmentOfRedeemablePartnershipUnitsToLiquidationValueAtPeriodEnd / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
adjustment to non controlling interest |  |  |  |  | (108)bdn_Adjustmenttononcontrollinginterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  | 108 bdn_Adjustmenttononcontrollinginterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock |  |  |  |  | (3,614)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (3,614)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Dividends, Preferred Stock, Cash | (6,900)us-gaap_DividendsPreferredStockCash |  |  |  | (6,900)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (6,900)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Preferred share/unit redemption charge | 0 us-gaap_RedemptionPremium | 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  |
Partners' Capital Account, Distributions |  |  |  |  | (101,164)us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  | (101,164)us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Ending Balance at Dec. 31, 2014 | $ 2,159,326 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 2,134,755 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember | $ 96,850 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember | $ 2,041,902 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember | $ (4,607)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (5,007)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 18,499 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 1,010 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 2,134,755 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_TotalPartnersEquityMember
Ending Balance, shares at Dec. 31, 2014 |  |  | 0 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesEPreferredStockMember | 4,000,000 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = bdn_SeriesELinkedPreferredStockMember | 179,293,160 us-gaap_SharesIssued / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_GeneralPartnerMember |  |  |  |  |

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