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REAL ESTATE INVESTMENTS - Schedule of Office Properties Sold (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
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Nov. 22, 2022 USD ($) ft² | Sep. 30, 2022 USD ($) | Jul. 29, 2022 USD ($) a | Jul. 14, 2022 USD ($) a ft² | Jun. 28, 2022 USD ($) | Apr. 14, 2022 USD ($) a | Jan. 20, 2022 USD ($) a | Sep. 08, 2021 USD ($) ft² | Jul. 06, 2021 USD ($) ft² | Feb. 02, 2021 USD ($) a | Dec. 21, 2020 USD ($) ft² property | Jul. 21, 2020 USD ($) ft² property | Jun. 15, 2020 USD ($) a | Mar. 19, 2020 USD ($) ft² | Dec. 31, 2022 USD ($) ft² | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 28, 2022 ft² | Jun. 28, 2022 a
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,677 | $ 142 | $ 289,461 |  |
Sale of ownership interest percentage |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,578,188 |  |  |  |
Mid-Atlantic Office Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable consideration |  |  |  |  |  |  |  |  |  |  | $ 4,100 |  |  |  |  |  |  |  |
Mid-Atlantic Office Portfolio | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable consideration holdback term (in months) |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Mid-Atlantic Office Portfolio | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable consideration holdback term (in months) |  |  |  |  |  |  |  |  |  |  | 9 months |  |  |  |  |  |  |  |
Commerce Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  | $ 115,000 |  |  |  |  |  |  |
Sale of ownership interest percentage |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |
Value of assets disposed of |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |
Net gain on disposition of real estate |  |  |  |  |  |  |  |  |  |  |  | $ 271,900 |  |  |  |  |  |  |
Office | 200 Barr Harbor Drive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² | 86,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price | $ 30,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale | $ 8,740 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |
Office | Mid-Atlantic Office Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  |  |  |  |  |  |  |  |  | 1,128,645 |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  | $ 192,943 |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  | $ 15,164 |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |
Office | Mid-Atlantic Office Portfolio | Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |
Office | Mid-Atlantic Office Portfolio | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Office | Commerce Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  |  |  |  |  |  |  |  |  | 1,896,142 | 1,896,142 |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  | $ 115,000 |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  | $ 271,905 |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Office | 52 East Swedesford Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  | 131,077 |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000 |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,336 |  |  |  |  |
Land | 11501 Burnet Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  | 4.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  | $ 32,513 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  | $ 8,340 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | 3151 Market Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700 |  |  |  |
Land | 25 M Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  | 0.8 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  | $ 29,675 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  | $ 400 |  |  |  | $ 3,836 |  |  |  |  |  |  |  |  |  |  |  |  |
Land | Gateway G & H |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  | $ 897 |  |  |  |  |  |  |  |  |  |  |  |
Land | 1100 Lenox Drive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | ft² |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  | $ 2,575 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  | $ 68 |  |  |  |  |  |  |  |  |  |  |
Land | 2100-2200 Lenox Drive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | ft² |  |  |  |  |  |  |  |  | 35.2 |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  | $ 8,900 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  | $ 842 |  |  |  |  |  |  |  |  |  |
Land | Keith Valley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  |  |  |  |  |  |  |  | 14.0 |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 201 |  |  |  |  |  |
Leasehold Interest | 3151 Market Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  | 0.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  | $ 30,394 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  | $ 2,583 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease agreement term (in years) |  |  |  | 99 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leasehold Interest | 3025 JFK Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  | $ 34,800 |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Office/Land | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,809 | 4.0
Sales Price |  |  |  |  | $ 4,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  |  |  | $ 831 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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