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Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |
Beginning Balance | $ (1,945) |  |
Change during year | (4,499) | 7,320 | 7,395
Ineffectiveness of the hedges | 0 | 0 | 125
Reclassification adjustment for (gains) losses reclassified to operations | (153) | (28) | 184
Ending Balance | (6,079) | (1,945) |
Accumulated Other Comprehensive Income (Loss) |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |
Beginning Balance | (1,945) | (9,138) | (17,005)
Change during year | (4,499) | 7,320 | 7,395
Non-controlling interest consolidated - real estate venture partner's share of unrealized (gains)/losses on derivative financial statements | 212 | (155) | 290
Ineffectiveness of the hedges |  |  | (125)
Other |  |  | 491
Reclassification adjustment for (gains) losses reclassified to operations | (153) | (28) | 184
Ending Balance | (6,079) | (1,945) | (9,138)
Unrealized Gains (Losses) on Securities |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |
Beginning Balance | (9) | (9) | (9)
Change during year | 0 | 0 | 0
Non-controlling interest consolidated - real estate venture partner's share of unrealized (gains)/losses on derivative financial statements | 0 | 0 | 0
Ineffectiveness of the hedges |  |  | 0
Other |  |  | 0
Reclassification adjustment for (gains) losses reclassified to operations | 0 | 0 | 0
Ending Balance | (9) | (9) | (9)
Cash Flow Hedges |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |
Beginning Balance | (1,936) | (9,129) | (16,996)
Change during year | (4,499) | 7,320 | 7,395
Non-controlling interest consolidated - real estate venture partner's share of unrealized (gains)/losses on derivative financial statements | 212 | (155) | 290
Ineffectiveness of the hedges |  |  | (125)
Other |  |  | 491
Reclassification adjustment for (gains) losses reclassified to operations | (153) | (28) | 184
Ending Balance | (6,070) | (1,936) | (9,129)
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |
Beginning Balance | (2,080) |  |
Change during year | (4,499) | 7,320 | 7,395
Ineffectiveness of the hedges | 0 | 0 | 125
Reclassification adjustment for (gains) losses reclassified to operations | (153) | (28) | 184
Ending Balance | (6,426) | (2,080) |
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Accumulated Other Comprehensive Income (Loss) |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |
Beginning Balance | 2,080 | (9,428) | (17,005)
Change during year | (4,499) | 7,320 | 7,395
Ineffectiveness of the hedges |  |  | (125)
Other |  |  | 491
Reclassification adjustment for (gains) losses reclassified to operations | (153) | (28) | (184)
Ending Balance | (6,426) | 2,080 | (9,428)
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Unrealized Gains (Losses) on Securities |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |
Beginning Balance | 9 | (9) | (9)
Change during year |  | 0 | 0
Ineffectiveness of the hedges |  |  | 0
Other |  |  | 0
Reclassification adjustment for (gains) losses reclassified to operations | 0 | 0 | 0
Ending Balance | (9) | 9 | (9)
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Cash Flow Hedges |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |
Beginning Balance | 2,071 | (9,419) | (16,996)
Change during year | (4,499) | 7,320 | 7,395
Ineffectiveness of the hedges |  |  | (125)
Other |  |  | 491
Reclassification adjustment for (gains) losses reclassified to operations | (153) | (28) | (184)
Ending Balance | $ (6,417) | $ 2,071 | $ (9,419)

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- Definition Other Comprehensive Income (Loss) Non-Controlling Interest Consolidated Real Estate Venture Partner's Share of Unrealized (gains) losses on derivative financial statements + References No definition available. + Details
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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580 + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80784-113994 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580 + Details
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- Definition Net of tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 31, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 18, 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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