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Partners Equity of The Operating Partnership (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 09, 2014
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount | $ 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |  | $ 25,584 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |  | $ 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent | $ 25,584 us-gaap_DividendsPayableCurrentAndNoncurrent |  |
Dividends, Preferred Stock, Cash |  |  |  |  |  |  |  |  | 6,900 us-gaap_DividendsPreferredStockCash | 6,900 us-gaap_DividendsPreferredStockCash | 10,405 us-gaap_DividendsPreferredStockCash |
Preferred shares, dividend rate (as a percent) |  |  |  |  |  |  |  |  | 6.90%us-gaap_PreferredStockDividendRatePercentage | 6.90%us-gaap_PreferredStockDividendRatePercentage |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, Basic |  |  |  |  |  |  |  |  | 6,024 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 38,982 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (37,309)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |
Income (loss) from continuing operations, Diluted |  |  |  |  |  |  |  |  | 6,024 bdn_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNonControllingInterestDiluted | 38,982 bdn_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNonControllingInterestDiluted | (37,309)bdn_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNonControllingInterestDiluted |
Amount allocated to unvested restricted shareholders |  |  |  |  |  |  |  |  | (349)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (363)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (376)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |
Amount allocated to unvested restricted shareholders, Diluted |  |  |  |  |  |  |  |  | (349)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted | (363)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted | (376)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted |
Preferred share/unit dividends, Basic |  |  |  |  |  |  |  |  | (6,900)us-gaap_DividendsPreferredStock | (6,900)us-gaap_DividendsPreferredStock | (10,405)us-gaap_DividendsPreferredStock |
Preferred share/unit dividends, Diluted |  |  |  |  |  |  |  |  | (6,900)bdn_PreferredStockDividendsDiluted | (6,900)bdn_PreferredStockDividendsDiluted | (10,405)bdn_PreferredStockDividendsDiluted |
Net loss attributable to non-controlling interests |  |  |  |  |  |  |  |  | 44 us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersRedeemable | 0 us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersRedeemable | 0 us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersRedeemable |
Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Redeemable, Diluted |  |  |  |  |  |  |  |  | (44)bdn_NoncontrollingInterestinNetIncomeLossJointVenturePartnersRedeemableDiluted | 0 bdn_NoncontrollingInterestinNetIncomeLossJointVenturePartnersRedeemableDiluted | 0 bdn_NoncontrollingInterestinNetIncomeLossJointVenturePartnersRedeemableDiluted |
Preferred share/unit redemption charge |  |  |  |  |  |  |  |  | 0 us-gaap_RedemptionPremium | 0 us-gaap_RedemptionPremium | (4,052)us-gaap_RedemptionPremium |
Preferred share/unit redemption Premium, Diluted |  |  |  |  |  |  |  |  | 0 bdn_RedemptionPremiumDiluted | 0 bdn_RedemptionPremiumDiluted | (4,052)bdn_RedemptionPremiumDiluted |
Income Loss from continuing operations available to common shareholders/unitholders, Basic |  |  |  |  |  |  |  |  | (1,182)bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic | 31,362 bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic | (51,279)bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic |
Income Loss from continuing operations available to common shareholders Diluted |  |  |  |  |  |  |  |  | (1,182)bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted | 31,362 bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted | (51,279)bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted |
Discontinued operations attributable to common unitholders |  |  |  |  |  |  |  |  | 918 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 4,207 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 43,838 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
Net income (loss) attributable to Common Shareholders/Unitholders |  |  |  |  |  |  |  |  | (274)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 35,514 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (8,238)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Net income (loss) available to common shareholders/unitholders, Diluted |  |  |  |  |  |  |  |  | (274)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 35,514 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | (8,238)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares/units outstanding, Basic |  |  |  |  |  |  |  |  | 166,202,649 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 153,140,458 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 143,257,097 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Contingent securities/Stock based compensation |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1,273,853 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Weighted-average shares/units outstanding, Diluted |  |  |  |  |  |  |  |  | 166,202,649 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 154,414,311 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 143,257,097 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Income per Common Partnership Unit: |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic |  |  |  |  |  |  |  |  | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.20 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.36)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted |  |  |  |  |  |  |  |  | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.20 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.36)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
Discontinued operations attributable to common shareholders/unitholders, Basic |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.30 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
Discontinued operations attributable to common shareholders, Diluted |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.30 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |
Net income (loss) attributable to common shareholders/unitholders, Basic | $ (0.02)us-gaap_EarningsPerShareBasic | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.00 us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.06 us-gaap_EarningsPerShareBasic | $ 0.03 us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic | $ 0.00 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic |
Net income (loss) attributable to common shareholders/unitholders, Diluted | $ (0.02)us-gaap_EarningsPerShareDiluted | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.00 us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ 0.03 us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted | $ 0.00 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount | 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  | 25,584 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  | 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 25,584 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Preferred shares, dividend rate (as a percent) |  |  |  |  |  |  |  |  | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, Basic |  |  |  |  |  |  |  |  | 6,024 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 38,982 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (37,309)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Income (loss) from continuing operations, Diluted |  |  |  |  |  |  |  |  | 6,024 bdn_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNonControllingInterestDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 38,982 bdn_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNonControllingInterestDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (37,309)bdn_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNonControllingInterestDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Amount allocated to unvested restricted shareholders |  |  |  |  |  |  |  |  | (349)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (363)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (376)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Amount allocated to unvested restricted shareholders, Diluted |  |  |  |  |  |  |  |  | (349)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (363)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (376)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred share/unit dividends, Basic |  |  |  |  |  |  |  |  | (6,900)us-gaap_DividendsPreferredStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (6,900)us-gaap_DividendsPreferredStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (10,405)us-gaap_DividendsPreferredStock / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred share/unit dividends, Diluted |  |  |  |  |  |  |  |  | (6,900)bdn_PreferredStockDividendsDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (6,900)bdn_PreferredStockDividendsDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (10,405)bdn_PreferredStockDividendsDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Net loss attributable to non-controlling interests |  |  |  |  |  |  |  |  | 44 us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersRedeemable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersRedeemable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersRedeemable / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Redeemable, Diluted |  |  |  |  |  |  |  |  | (44)bdn_NoncontrollingInterestinNetIncomeLossJointVenturePartnersRedeemableDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 bdn_NoncontrollingInterestinNetIncomeLossJointVenturePartnersRedeemableDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 bdn_NoncontrollingInterestinNetIncomeLossJointVenturePartnersRedeemableDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred share/unit redemption charge |  |  |  |  |  |  |  |  | 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (4,052)us-gaap_RedemptionPremium / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred share/unit redemption Premium, Diluted |  |  |  |  |  |  |  |  | 0 bdn_RedemptionPremiumDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 bdn_RedemptionPremiumDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (4,052)bdn_RedemptionPremiumDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Income Loss from continuing operations available to common shareholders/unitholders, Basic |  |  |  |  |  |  |  |  | (1,181)bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 31,719 bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (52,142)bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Income Loss from continuing operations available to common shareholders Diluted |  |  |  |  |  |  |  |  | (1,181)bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 31,719 bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (52,142)bdn_IncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Discontinued operations attributable to common unitholders |  |  |  |  |  |  |  |  | 918 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 4,207 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 43,838 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Discontinued operations attributable to common unitholders, Diluted |  |  |  |  |  |  |  |  | 918 bdn_IncomeLossFromDiscontinuedOperationsNetOfTaxDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 4,207 bdn_IncomeLossFromDiscontinuedOperationsNetOfTaxDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 43,838 bdn_IncomeLossFromDiscontinuedOperationsNetOfTaxDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Net income (loss) attributable to Common Shareholders/Unitholders |  |  |  |  |  |  |  |  | (263)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 35,926 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (8,304)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Net income (loss) available to common shareholders/unitholders, Diluted |  |  |  |  |  |  |  |  | $ (263)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 35,926 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (8,304)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares/units outstanding, Basic |  |  |  |  |  |  |  |  | 167,942,246 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 154,929,545 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 145,883,217 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Contingent securities/Stock based compensation |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,273,853 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Weighted-average shares/units outstanding, Diluted |  |  |  |  |  |  |  |  | 167,942,246 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 156,203,398 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 145,883,217 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Income per Common Partnership Unit: |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic |  |  |  |  |  |  |  |  | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.20 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (0.36)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted |  |  |  |  |  |  |  |  | $ (0.01)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.20 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (0.36)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Discontinued operations attributable to common shareholders/unitholders, Basic |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.30 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Discontinued operations attributable to common shareholders, Diluted |  |  |  |  |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.30 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Net income (loss) attributable to common shareholders/unitholders, Basic |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.23 us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (0.06)us-gaap_EarningsPerShareBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Net income (loss) attributable to common shareholders/unitholders, Diluted |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 0.23 us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ (0.06)us-gaap_EarningsPerShareDiluted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Dividend Declared [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |  |  |  |  |
Earnings per Common Partnership Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  |  |  |  |  |  |  | $ 0.15 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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