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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Investment in Real Estate Ventures and Share of Real Estate Ventures' Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 21, 2020 | Aug. 01, 2018 | Jun. 26, 2018 | May 29, 2015 | Jul. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Carrying Amount | $ 389,811 | $ 120,294 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (18,584) | (9,922) | $ (15,231) |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 963,018 | 596,007 |  |  |  |  |  |
Commerce Square Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 70.00% |  |  |  |  |  |  |
Carrying Amount | $ 253,128 | 0 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (9,150) | 0 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 219,168 | 0 |  |  |  |  |  |
Mid-Atlantic Office JV |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 40.00% |  |  | 40.00% |  |  |  |
Carrying Amount | $ 32,996 | 0 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 96 | 0 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 120,831 | 0 |  |  |  |  |  |
Brandywine - AI Venture LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |  |  |
Carrying Amount | $ 10,302 | 10,116 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 185 | (2,800) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |  |  |
Herndon Innovation Center Metro Portfolio Venture, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 15.00% |  |  |  |  |  |  |
Carrying Amount | $ 16,019 | 16,446 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (358) | (498) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 207,302 | 207,302 |  |  |  |  |  |
MAP Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |  |  |
Carrying Amount | $ (11,516) | (70) |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (6,570) | (6,102) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 185,000 | 185,000 |  |  | $ 180,800 |  |  |
PJP VII |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 25.00% |  |  |  |  |  |  |
Carrying Amount | $ 0 | 0 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 0 | 190 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |  |  |
PJP Two |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 30.00% |  |  |  |  |  |  |
Carrying Amount | $ 0 | 0 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 0 | 81 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |  |  |
PJP VI |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 25.00% |  |  |  |  |  |  |
Carrying Amount | $ 0 | 0 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 0 | (185) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |  |  |
1919 Ventures |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  | 50.00% |  |
Carrying Amount | $ 15,434 | 17,524 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | 59 | 328 |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 88,860 | 88,860 |  |  |  |  |  |
4040 Wilson Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |  |  | 50.00%
Carrying Amount | $ 34,454 | 37,002 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (2,162) | (368) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 141,857 | 114,845 |  |  |  |  |  |
JBG 51 N 50 Patterson |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 70.00% |  |  |  |  |  | 70.00% |
Carrying Amount | $ 21,237 | 21,531 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (457) | (313) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | 0 |  |  |  |  |  |
JBG 1250 First Street Office |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 70.00% |  |  |  |  |  | 70.00% |
Carrying Amount | $ 17,757 | 17,745 |  |  |  |  |  |
Company's Share of Real Estate Venture Income (Loss) | (227) | (255) |  |  |  |  |  |
Real Estate Venture Debt at 100%, gross | $ 0 | $ 0 |  |  |  |  |  |

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