DISPOSITIONS AND IMPAIRMENTS - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2024 USD ($) property	Jun. 30, 2024 USD ($) property	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) property	Jun. 30, 2023 USD ($)	Dec. 31, 2023 property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties		1,318		1,318
Proceeds from real estate disposals | $				$ 238,091	$ 64,405
Gain on real estate dispositions | $		$ 49,670	$ 1,405	$ 50,011	11,606
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held-for-sale		3		3		17
Depreciation and amortization
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of real estate | $		$ 44,900	$ 10,700	$ 50,300	$ 19,200
SHOP | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held-for-sale		3		3		13
Triple-Net Leased Properties | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held-for-sale		0		0		1
Outpatient Medical and Research Portfolio | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties classified as held-for-sale		0		0		3
Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from real estate disposals | $				$ 234,100
Gain on real estate dispositions | $				$ 50,000
Dispositions | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from real estate disposals | $	$ 2,100
Dispositions | SHOP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties		15		15
Dispositions | SHOP | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties	1
Dispositions | Outpatient Medical Buildings and Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties		10		10
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		23		23
Dispositions | Vacant Outpatient Medical Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties		1		1