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Share Based Deferred Compensation (Restricted Performance Share Units) (Details) (Executive Officer [Member], Restricted Performance Share Units Plan [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended
Mar. 11, 2014
Mar. 12, 2014
Mar. 01, 2012
Dec. 31, 2014
Feb. 25, 2014
Dec. 31, 2013
Feb. 25, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 2,624us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 1,225us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue $ 4,273us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue   $ 4,137us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       599,397us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber   473,215us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       196,004us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (69,822)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 134,284us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 61,720us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 265,222us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized       231,093us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
March 1, 2012 RSPU Grant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       207,383us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March12012RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		   242,122us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March12012RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March12012RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (34,739)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March12012RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
February 25, 2013 RSPU Grant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       199,577us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_February252013RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		   231,093us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_February252013RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_February252013RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (31,516)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_February252013RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
March 11, 2014 RSPU Grant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       130,717us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March112014RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March112014RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       134,284us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March112014RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (3,567)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March112014RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
March 12, 2014 RSPU Grant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       61,720us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March122014RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March122014RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       61,720us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March122014RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bdn_RestrictedPerformanceShareUnitsPlanMember
/ bdn_GrantsofRSPUsAxis
= bdn_March122014RSPUGrantMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember		      
Cliff Vesting [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights   three year cliff vesting period