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SUMMARY OF QUARTERLY RESULTS (UNAUDITED) (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 11, 2018 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Sep. 30, 2018 USD ($) property $ / shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 147,039 | $ 145,331 | $ 144,151 | $ 143,896 | $ 139,203 | $ 134,998 | $ 133,786 | $ 136,358 | $ 580,417 | $ 544,345 | $ 520,493
Net income (loss) |  | 16,874 | 6,820 | 6,252 | 4,583 | 121,673 | (43,522) | 12,876 | 44,445 | 34,529 | 135,472 | 121,177
Net income (loss) allocated to common equity holders |  | $ 16,676 | $ 6,679 | $ 6,112 | $ 4,404 | $ 120,792 | $ (43,260) | $ 12,661 | $ 43,956 | $ 34,267 | $ 134,518 | $ 120,173
Basic earnings per Common Share (in dollars per shares) | $ / shares |  | $ 0.09 | $ 0.04 | $ 0.03 | $ 0.03 | $ 0.68 | $ (0.24) | $ 0.07 | $ 0.25 | $ 0.19 | $ 0.75 | $ 0.65
Diluted earnings (loss) per Common Share (in dollars per shares) | $ / shares |  | $ 0.09 | $ 0.04 | $ 0.03 | $ 0.03 | $ 0.67 | $ (0.24) | $ 0.07 | $ 0.24 | $ 0.19 | $ 0.75 | $ 0.65
Net gain on real estate venture transactions |  |  |  |  |  |  |  |  |  | $ 11,639 | $ 142,233 | $ 80,526
Gain on promoted interest in unconsolidated real estate venture |  |  |  |  |  |  |  |  |  | 0 | 28,283 | 0
DRA Austin Venture |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) allocated to common equity holders |  |  |  |  |  |  |  |  |  | 1,300 |  |
Net gain on real estate venture transactions | $ 103,800 |  |  |  |  |  |  |  |  |  |  |
Gain on promoted interest in unconsolidated real estate venture | $ 28,300 |  |  |  |  |  |  |  |  |  |  |
PJP II, PJP VII, And PJP VII |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain on real estate venture transactions |  | $ 8,000 |  |  |  |  |  |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | 147,039 | $ 145,331 | $ 144,151 | $ 143,896 | $ 139,203 | $ 134,998 | $ 133,786 | $ 136,358 | 580,417 | 544,345 | 520,493
Net income (loss) |  | 16,874 | 6,820 | 6,252 | 4,583 | 121,673 | (43,522) | 12,876 | 44,445 | $ 34,529 | $ 135,472 | $ 121,177
Net income (loss) allocated to common equity holders |  | $ 16,772 | $ 6,716 | $ 6,146 | $ 4,430 | $ 121,575 | $ (43,622) | $ 12,769 | $ 44,326 |  |  |
Basic earnings per Common Share (in dollars per shares) | $ / shares |  | $ 0.09 | $ 0.04 | $ 0.03 | $ 0.03 | $ 0.68 | $ (0.24) | $ 0.07 | $ 0.25 | $ 0.19 | $ 0.75 | $ 0.65
Diluted earnings (loss) per Common Share (in dollars per shares) | $ / shares |  | $ 0.09 | $ 0.04 | $ 0.03 | $ 0.03 | $ 0.67 | $ (0.24) | $ 0.07 | $ 0.24 | $ 0.19 | $ 0.75 | $ 0.65
Net gain on real estate venture transactions |  |  |  |  |  |  |  |  |  | $ 11,639 | $ 142,233 | $ 80,526
Gain on promoted interest in unconsolidated real estate venture |  |  |  |  |  |  |  |  |  | $ 0 | $ 28,283 | $ 0
BRANDYWINE OPERATING PARTNERSHIP, L.P. | DRA Austin Venture |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain on real estate venture transactions |  |  |  |  |  | $ 103,800 |  |  |  |  |  |
Gain on promoted interest in unconsolidated real estate venture |  |  |  |  |  | $ 28,300 |  |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Metropolitan Washington, D.C. - Office |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  |  |  |  |  | $ 56,900 |  |  |  |  |
Number of properties contributed to a joint venture | property |  |  |  |  |  |  | 8 |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. | PJP II, PJP VII, And PJP VII |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain on real estate venture transactions |  | $ 8,000 |  |  |  |  |  |  |  |  |  |

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