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Fair Value of Financial Instruments (Details) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
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Company's estimates of fair value differ from the carrying amounts |  |
Mortgage payable, net of discounts, Carrying Amount | $ 588,823 | $ 711,789
Mortgage payable, net of discounts, Fair Value | 602,815 | 726,348
Unsecured notes payable, net of discounts, Carrying Amount | 1,573,588 | 1,274,047
Unsecured notes payable, net of discounts, Fair Value | 1,726,338 | 1,338,743
Variable Rate Debt Instruments, Carrying Amount | 303,610 | 444,610
Variable Rate Debt Instruments, Fair Value | 295,131 | 432,556
Notes Receivable, Carrying Amount | 32,255 | 31,216
Notes Receivable, Fair Value | $ 29,995 | $ 28,921

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- Definition Secured Debt Principal Balance Outstanding. + Details
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Namespace Prefix: | bdn
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Secured Debt Principal Balance Outstanding Fair Value Disclosure. + Details
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- Definition Unsecured notes payable, net of discounts, Carrying Amount. + Details
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- Definition Unsecured notes payable, net of discounts, Fair Value. + Details
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- Definition Variable Rate Debt Instruments, Carrying Amount. + Details
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- Definition Variable Rate Debt Instruments, Fair Value. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph b -Article 5 + Details
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- Definition For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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