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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Brandywine - AI Venture (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) ft² property | Dec. 31, 2017 USD ($) ft²
Schedule of Equity Method Investments [Line Items] |  |  |
Outstanding indebtedness | $ 2,144,418 | $ 2,028,046 |
Net gain on real estate venture transactions | 11,639 | 142,233 | $ 80,526
Encumbrances | 315,437 |  |
Proceeds from real estate venture sales | $ 9,730 | 60,346 | 145,416
Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other-than-temporary impairment |  | $ 4,076 | $ 4,844
Station Square | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Rentable square feet | ft² |  | 510,202 |
Net gain on real estate venture transactions |  | $ 1,500 |
Number of properties sold | property |  | 3 |
Gross sales price |  | $ 107,000 |
Encumbrances |  | 66,500 |
Debt prepayment penalty |  | 700 |
Gross proceeds from sale |  | 34,800 |
Proceeds from real estate venture sales |  | 17,400 |
Fairview Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other-than-temporary impairment |  | 4,100 |
Fairview Properties | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of office properties owned | property | 1 |  |
Impairment of properties held for use | $ 5,600 | $ 20,800 |
Impairment hold period |  | 10 years |
7101 Washington Avenue | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Rentable square feet | ft² |  |  | 230,904
Net gain on real estate venture transactions |  |  | $ 13,800
Encumbrances |  |  | 37,400
Debt prepayment penalty |  |  | 800
Gross proceeds from sale |  |  | 63,600
Proceeds from real estate venture sales |  |  | 105,700
Other-than-temporary impairment |  |  | $ 4,800
Impairment hold period |  |  | 10 years
Falls Church, Virginia | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Rentable square feet | ft² |  | 180,659 |
Outstanding indebtedness | 26,000 |  |
Net gain on real estate venture transactions | 2,200 |  |
Residual Capitalization Rates | Fairview Properties | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Measurement input |  | 0.080 |
Residual Capitalization Rates | 7101 Washington Avenue | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Measurement input |  |  | 0.075
Minimum | Discount Rates | Fairview Properties | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Measurement input |  | 0.090 |
Minimum | Discount Rates | 7101 Washington Avenue | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Measurement input |  |  | 0.078
Maximum | Discount Rates | Fairview Properties | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Measurement input |  | 0.095 |
Maximum | Discount Rates | 7101 Washington Avenue | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Measurement input |  |  | 0.085
Brandywine Realty Trust | Fairview Properties | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Impairment of properties held for use | $ 2,800 | $ 10,400 |
Brandywine Realty Trust | 7101 Washington Avenue | Brandywine - AI Venture LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from real estate venture sales |  |  | $ 31,800

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