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Distributions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Distributions [Abstract] |  |  |
Common Share Distributions Payments of Ordinary Dividends | $ 0.41 bdn_CommonShareDistributionsPaymentsOfOrdinaryDividends | $ 0.52 bdn_CommonShareDistributionsPaymentsOfOrdinaryDividends | $ 0.39 bdn_CommonShareDistributionsPaymentsOfOrdinaryDividends
Common Share Distributions Capital Gain | $ 0.02 bdn_CommonShareDistributionsCapitalGain | $ 0.00 bdn_CommonShareDistributionsCapitalGain | $ 0.00 bdn_CommonShareDistributionsCapitalGain
Common Share Distributions Non-taxable Distributions | $ 0.17 bdn_CommonShareDistributionsNonTaxableDistributions | $ 0.08 bdn_CommonShareDistributionsNonTaxableDistributions | $ 0.21 bdn_CommonShareDistributionsNonTaxableDistributions
Common Stock, Dividends, Per Share, Declared | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared
Percentage Of Distributions classified as ordinary income | 69.00%bdn_PercentageOfDistributionsClassifiedAsOrdinaryIncome | 87.00%bdn_PercentageOfDistributionsClassifiedAsOrdinaryIncome | 65.00%bdn_PercentageOfDistributionsClassifiedAsOrdinaryIncome
Percentage Of Distributions classified as capital gain | 3.30%bdn_PercentageOfDistributionsClassifiedAsCapitalGain | 0.00%bdn_PercentageOfDistributionsClassifiedAsCapitalGain | 0.00%bdn_PercentageOfDistributionsClassifiedAsCapitalGain
Percentage Of Distributions classified as non-taxable distribution | 27.70%bdn_PercentageOfDistributionsClassifiedAsNonTaxableDistribution | 13.00%bdn_PercentageOfDistributionsClassifiedAsNonTaxableDistribution | 35.00%bdn_PercentageOfDistributionsClassifiedAsNonTaxableDistribution
Dividends, Preferred Stock | $ 6,900 us-gaap_DividendsPreferredStock | $ 6,900 us-gaap_DividendsPreferredStock | $ 10,405 us-gaap_DividendsPreferredStock
Percentage Of Preferred Distributions classified as ordinary income | 100.00%bdn_PercentageOfPreferredDistributionsClassifiedAsOrdinaryIncome | 100.00%bdn_PercentageOfPreferredDistributionsClassifiedAsOrdinaryIncome | 100.00%bdn_PercentageOfPreferredDistributionsClassifiedAsOrdinaryIncome

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- Definition Common Share Distributions Capital Gain + References No definition available. + Details
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- Definition Common Share Distributions Non-taxable Distributions + References No definition available. + Details
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- Definition Common Share Distributions Payments of Ordinary Dividends + References No definition available. + Details
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- Details
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- Definition Percentage Of Distributions classified as capital gain + References No definition available. + Details
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- Definition Percentage Of Distributions classified as non-taxable distribution + References No definition available. + Details
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- Definition Percentage Of Distributions classified as ordinary income + References No definition available. + Details
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- Definition Percentage Of Preferred Distributions classified as ordinary income + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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