REAL ESTATE INVESTMENTS - Dispositions Narrative (Details) $ in Thousands		12 Months Ended
	Feb. 02, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 23, 2021 USD ($)	Feb. 02, 2021 a	Feb. 02, 2021 ft²	Nov. 05, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on sale of undepreciated real estate		$ 2,903	$ 201	$ 2,020
Net gain on disposition of real estate		$ 142	$ 289,461	356
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
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
3025 JFK Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lease agreement term	99 years
Land area						1	1
Investment in real estate venture	$ 34,800				$ 34,800
Net gain on sale of undepreciated real estate	$ 2,000
1505-11 Race Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs capitalized								$ 300