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Intangible Assets (Details 1) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Annual amortization of intangible assets and liabilities |  |  |
Intangible Assets, net | $ 99,403,000 us-gaap_FiniteLivedIntangibleAssetsNet | $ 132,329,000 us-gaap_FiniteLivedIntangibleAssetsNet |
Assets [Member] |  |  |
Annual amortization of intangible assets and liabilities |  |  |
2015 | 21,363,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember |  |
2016 | 16,898,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember |  |
2017 | 15,148,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember |  |
2018 | 11,399,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember |  |
2019 | 10,086,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember |  |
Thereafter | 24,509,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember |  |
Intangible Assets, net | 99,403,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember |  |
Liabilities [Member] |  |  |
Annual amortization of intangible assets and liabilities |  |  |
2015 | (5,212,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember |  |
2016 | (3,253,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember |  |
2017 | (2,664,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember |  |
2018 | (2,241,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember |  |
2019 | (1,909,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember |  |
Thereafter | (10,731,000)us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember |  |
Intangible Assets, net | (26,010,000)us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_LiabilitiesTotalMember |  |
Tenant Move-Outs Prior to End of the Lease Term [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets Written Off Through Accelerated Amortization | $ 800,000 bdn_IntangibleAssetsWrittenOffThroughAcceleratedAmortization / us-gaap_FairValueByAssetClassAxis = bdn_TenantMoveOutsPriorToEndOfLeaseTermMember | $ 1,600,000 bdn_IntangibleAssetsWrittenOffThroughAcceleratedAmortization / us-gaap_FairValueByAssetClassAxis = bdn_TenantMoveOutsPriorToEndOfLeaseTermMember | $ 1,400,000 bdn_IntangibleAssetsWrittenOffThroughAcceleratedAmortization / us-gaap_FairValueByAssetClassAxis = bdn_TenantMoveOutsPriorToEndOfLeaseTermMember

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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