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DISPOSITIONS - DISPOSITIONS - (Details) $ in Thousands	3 Months Ended
DISPOSITIONS - DISPOSITIONS - (Details) $ in Thousands	Mar. 31, 2021 USD ($) property	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	1,200
Proceeds from real estate disposals	$ 8,083	$ 625,439
Gain on real estate dispositions	2,533	226,225
Construction in progress	310,547		$ 265,748
Impairment of real estate	$ 78,500	$ 12,200
Triple-Net Leased Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	358
Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on real estate dispositions	$ 2,500
Proceeds from sale of real estate	$ 8,100
Dispositions \| Triple-Net Leased Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	1
Dispositions \| Medical Office Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	2