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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |  |
Beneficiaries' Equity, Beginning Balance |  | $ 1,811,028 | $ 1,826,870 | $ 1,864,388
Partners' Equity, Beginning Balance |  | 1,798,508 |  |
Unrealized gain (loss) on derivative financial instruments |  | (8,210) | 1,478 | 2,948
Allocation of unrealized (gains)/losses on derivative financial instruments to noncontrolling interests |  | 41 | (39) | (34)
Amortization of interest rate contracts reclassified from comprehensive income to interest expense | [1] | 770 | 1,191 | 1,230
Beneficiaries' Equity, Ending Balance |  | 1,688,303 | 1,811,028 | 1,826,870
Partners' Equity, Ending Balance |  |  | 1,798,508 |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |  |
Partners' Equity, Beginning Balance |  | 1,798,508 | 1,799,955 | 1,840,593
Unrealized gain (loss) on derivative financial instruments |  | (8,210) | 1,478 | 2,948
Amortization of interest rate contracts reclassified from comprehensive income to interest expense | [1] | 770 | 1,191 | 1,230
Partners' Equity, Ending Balance |  | 1,672,915 | 1,798,508 | 1,799,955
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |  |
Beneficiaries' Equity, Beginning Balance |  | 5,029 | 2,399 | (1,745)
Beneficiaries' Equity, Ending Balance |  | (2,370) | 5,029 | 2,399
Accumulated Other Comprehensive Income (Loss) | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |
Schedule of Accumulated other comprehensive income (loss) [Line Items] |  |  |  |
Partners' Equity, Beginning Balance |  | 4,725 | 2,056 | (2,122)
Partners' Equity, Ending Balance |  | $ (2,715) | $ 4,725 | $ 2,056
[1] | Amounts reclassified from comprehensive income to interest expense within the Consolidated Statements of Operations.

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- Definition Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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