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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Austin Venture (Details) $ in Thousands |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 11, 2018 USD ($) ft² property | Oct. 18, 2017 USD ($) ft² property | Oct. 17, 2017 USD ($) property | Dec. 31, 2019 USD ($) ft² property | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Oct. 16, 2013 USD ($) ft² property
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  | 16,711,387 |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties |  |  |  | $ 596,007 | $ 370,319 |  |  |  |
Net gain on real estate venture transactions |  |  |  | $ 11,639 | $ 142,233 | $ 80,526 |  |  |
Number of Properties | property |  |  |  | 95 |  |  |  |  |
Austin Joint Venture |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |  |  |  |  |
Number of properties sold | property |  | 8 | 7 |  |  |  |  |  |
Rentable square feet | ft² |  | 1,164,496 |  |  |  |  |  |  |
Gross sales price |  | $ 333,250 |  |  |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties |  | 150,968 | $ 151,000 |  |  |  |  |  |
Proceeds from divestiture of businesses, net of cash divested |  | 86,400 |  |  |  |  |  |  |
Net gain on real estate venture transactions |  | 40,092 |  |  |  |  |  |  |
Deferred gain on sale |  | $ 12,072 |  |  |  |  |  |  |
Brandywine Realty Trust |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 50.00% |  |  |  |  |
Equity method investment, additional distribution rights |  |  |  | 10.00% |  |  |  |  |
Brandywine Realty Trust | Austin Joint Venture |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of properties contributed to a joint venture | property |  |  |  |  |  |  |  |  | 7
Area of real estate property | ft² |  |  |  |  |  |  |  |  | 1,398,826
Aggregate gross sales price of a joint venture |  |  |  |  |  |  |  |  | $ 330,000
Equity method investment, agreement to pay future capital expenditures |  |  |  |  |  |  | $ 4,400 | $ 800 | $ 5,200
DRA Advisors LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 50.00% |  |  |  |  |
DRA Austin Venture |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² | 1,570,123 |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |  |  |  |
Net gain on real estate venture transactions | $ 103,800 |  |  |  |  |  |  |  |
Aggregate purchase price | $ 535,100 |  |  |  |  |  |  |  |
Number of Properties | property | 12 |  |  |  |  |  |  |  |

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