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REAL ESTATE INVESTMENTS - Summary of Office Properties Sold (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Sep. 11, 2019 USD ($) ft² | Mar. 15, 2019 USD ($) a | Dec. 21, 2018 USD ($) ft² | Dec. 20, 2018 USD ($) ft² | Jun. 21, 2018 USD ($) ft² | Mar. 16, 2018 USD ($) a | Jan. 10, 2018 USD ($) a | Nov. 22, 2017 USD ($) a | Oct. 31, 2017 USD ($) a | Sep. 13, 2017 USD ($) a | Jul. 18, 2017 USD ($) a | Jun. 27, 2017 USD ($) ft² | Jun. 12, 2017 USD ($) ft² | Apr. 28, 2017 USD ($) a | Mar. 30, 2017 USD ($) ft² | Mar. 15, 2017 USD ($) ft² | Mar. 13, 2017 USD ($) ft² | Feb. 15, 2017 USD ($) a | Feb. 02, 2017 USD ($) ft² | Jan. 30, 2017 USD ($) a | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 356 | $ 2,932 | $ 32,017
Office Properties | 1900 Gallows Rd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² | 210,632 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price | $ 36,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale | $ (367) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | Rockpoint Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  | 1,293,197 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  | $ 312,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  | $ 397 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | 20 East Clementon Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  | 38,260 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  | $ (35) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | 11, 14, 15, 17 and 18 Campus Boulevard (Newtown Square) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | a |  |  |  |  |  |  |  | 252,802 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  | $ 42,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  | $ 19,642 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | 630 Allendale Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | a |  |  |  |  |  |  |  |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  | $ 17,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  | $ 3,605 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | Two, Four A, Four B and Five Eves Drive (Evesham Corporate Center) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  |  |  |  |  |  | 134,794 |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  | $ 9,700 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  | $ (325) |  |  |  |  |  |  |  |  |  |  |
Office Properties | 200, 210 & 220 Lake Drive East (Woodland Falls) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 215,465 |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,000 |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (249) |  |  |  |  |  |  |  |
Office Properties | 11700, 11710, 11720 & 11740 Beltsville Drive (Calverton) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 313,810 |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000 |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Office Properties | 1200 & 1220 Concord Avenue (Concord Airport Plaza) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,256 |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,100 |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 551 |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |
Land | 9 Presidential Boulevard |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  | 2.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  | $ 5,325 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  | $ 751 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | Garza Ranch Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  | 6.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  | $ 14,571 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  | $ 1,515 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | Westpark Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  |  | 13.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  | $ 485 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  | $ 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | 50 E. Swedesford Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  |  |  |  |  | 12.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  | $ 7,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  | $ 882 |  |  |  |  |  |  |  |  |  |  |  |  |
Land | Bishops Gate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  |  |  |  |  |  | 49.5 |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  | $ 71 |  |  |  |  |  |  |  |  |  |  |  |
Land | Garza Ranch - Multi-family |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.4 |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,800 |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,311 |  |  |  |  |  |  | $ 3,000 |  |
Land | Gateway Land - Site C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.8 |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Land | Garza Ranch - Hotel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres | a |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.7 |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500 |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 192 |  |  |
Retail Properties | 7000 Midlantic Drive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 10,784 |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,200 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,413 |  |  |  |  |  |  |  |  |  |
Mixed-use Properties | Subaru National Training Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  | 83,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  | $ 45,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  | $ 2,570 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mixed-use Properties | Philadelphia Marine Center (Marine Piers) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable square feet | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 181,900 |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,400 |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,498 |  |  |  |  |  |  |

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