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REAL ESTATE INVESTMENTS - Summary of Office Properties Sold (Additional Information) (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 15, 2017 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2017 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net gain on disposition of real estate |  |  |  | $ 356 | $ 2,932 | $ 32,017
Number of Properties | property |  |  |  | 95 |  |
Building and improvements |  |  |  | $ 3,049,395 | 3,048,889 |
Proceeds from the sale of properties |  |  |  | 41,795 | $ 324,090 | 171,860
Subaru National Training Center |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Direct finance lease, interest income |  | $ 1,600 |  |  |  |
Philadelphia Marine Center (Marine Piers) |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Payment by cash on purchases | $ 12,000 |  |  |  |  |
Proceeds from the sale of properties | 11,200 |  |  |  |  |
Balance payment on purchase price | $ 9,400 |  |  |  |  |
Prior Period Disposals |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net gain on disposition of real estate |  |  |  | 700 |  |
Other |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties | property |  |  | 4 |  | 1 |
Impairment of properties held for use |  |  | $ 1,000 |  | $ 14,800 |
Carrying value of real estate prior to impairment |  |  |  | 10,200 | $ 52,800 |
Impairment hold period |  |  | 10 years |  | 10 years |
Other | Impairment on Held for Use Properties |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Building and improvements |  |  |  | 9,200 | $ 38,000 |
Other | Residual Capitalization Rates |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Measurement input for impairment on assets held for sale |  |  | 0.0900 |  | 0.075 |
Other | Discount Rates |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Measurement input for impairment on assets held for sale |  |  | 0.0925 |  | 0.095 |
Land |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net gain on disposition of real estate |  |  |  | $ 1,000 |  |
Land | 11700, 11710, 11720 & 11740 Beltsville Drive (Calverton) |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Purchase price reduction |  |  |  |  |  | 1,700
Provision for impairment on assets held for sale |  |  |  |  |  | $ 1,700

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