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Debt Obligations (Outstanding Unsecured Notes in Series of Transactions) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of principal payments of debt obligations |  |  |
Principal | $ 376,174 us-gaap_ExtinguishmentOfDebtAmount | $ 29,250 us-gaap_ExtinguishmentOfDebtAmount | $ 164,968 us-gaap_ExtinguishmentOfDebtAmount
Repurchase Amount | 383,768 us-gaap_EarlyRepaymentOfSeniorDebt | 31,369 us-gaap_EarlyRepaymentOfSeniorDebt | 338,097 us-gaap_EarlyRepaymentOfSeniorDebt
Gain (Loss) on Early Extinguishment of Debt | (7,594)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost | (2,119)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost | (22,002)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost
Acceleration of Deferred Financing Amortization | 152 us-gaap_WriteOffOfDeferredDebtIssuanceCost | 40 us-gaap_WriteOffOfDeferredDebtIssuanceCost | 451 us-gaap_WriteOffOfDeferredDebtIssuanceCost
Note Three [Member] |  |  |
Schedule of principal payments of debt obligations |  |  |
Principal |  |  | 301 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteThreeMember
Repurchase Amount |  |  | 303 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteThreeMember
Gain (Loss) on Early Extinguishment of Debt |  |  | (2)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteThreeMember
Acceleration of Deferred Financing Amortization |  |  | 0 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteThreeMember
Note Four [Member] |  |  |
Schedule of principal payments of debt obligations |  |  |
Principal | 218,549 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember | 19,830 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember | 4,302 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember
Repurchase Amount | 219,404 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember | 20,853 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember | 4,566 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember
Gain (Loss) on Early Extinguishment of Debt | (855)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember | (1,020)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember | (264)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember
Acceleration of Deferred Financing Amortization | 9 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember | 16 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember | 8 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFourMember
Note Five [Member] |  |  |
Schedule of principal payments of debt obligations |  |  |
Principal | 157,625 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember | 8,910 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember | 60,794 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember
Repurchase Amount | 164,364 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember | 9,945 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember | 69,497 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember
Gain (Loss) on Early Extinguishment of Debt | (6,739)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember | (1,036)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember | (8,712)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember
Acceleration of Deferred Financing Amortization | 143 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember | 23 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember | 183 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteFiveMember
Note Six [Member] |  |  |
Schedule of principal payments of debt obligations |  |  |
Principal |  | 510 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember | 99,571 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember
Repurchase Amount |  | 571 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember | 112,541 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember
Gain (Loss) on Early Extinguishment of Debt |  | (63)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember | (13,024)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember
Acceleration of Deferred Financing Amortization |  | 1 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember | 260 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_ExtinguishmentOfDebtAxis = bdn_NoteSixMember
Discharge of Debt [Member] |  |  |
Schedule of principal payments of debt obligations |  |  |
Repurchase Amount | $ 383,768 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_DischargeOfDebtMember | $ 31,369 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_DischargeOfDebtMember | $ 186,907 us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_DischargeOfDebtMember

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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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- Definition Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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