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DISPOSITIONS - DISPOSITIONS - (Details) $ in Thousands	3 Months Ended		6 Months Ended
DISPOSITIONS - DISPOSITIONS - (Details) $ in Thousands	Jun. 30, 2020 USD ($) property	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) property	Jun. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from real estate disposals			$ 627,804	$ 74,405
Number of real estate properties \| property	1,200		1,200
Gain on real estate dispositions	$ 1,254	$ 19,150	$ 227,479	24,597
Impairment of real estate			$ 121,500	$ 13,500
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	385		385
Dispositions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate			$ 11,500
Gain on real estate dispositions			$ 2,800
Dispositions [Member] \| Medical Office Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	1		1
Dispositions [Member] \| Senior Housing Communities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	1		1
the Fund [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from real estate disposals			$ 620,000
Equity Method Investment, Ownership Percentage	21.00%		21.00%
Gain on real estate dispositions			$ 224,600
the Fund [Member] \| Dispositions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	6		6
Same Campus [Member] \| the Fund [Member] \| Dispositions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	2		2