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DISPOSITIONS AND IMPAIRMENTS - Assets Held For Sale and Impairment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	$ 56,489	$ 44,893
Liabilities Related to Assets Held for Sale	9,243	6,492
SHOP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	48,173	44,852
Liabilities Related to Assets Held for Sale	6,419	5,675
Triple-net leased properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	2,885	0
Liabilities Related to Assets Held for Sale	181	0
Outpatient Medical Buildings And Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	5,431	41
Liabilities Related to Assets Held for Sale	$ 2,643	$ 817
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 Held for Sale \| property	17	3
Disposal Group, Held-for-sale, Not Discontinued Operations \| SHOP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale \| property	13	3
Disposal Group, Held-for-sale, Not Discontinued Operations \| Triple-net leased properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale \| property	1	0
Disposal Group, Held-for-sale, Not Discontinued Operations \| Outpatient Medical Buildings And Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale \| property	3	0
Depreciation and amortization
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairments related to natural disasters	$ 226,600	$ 107,800	$ 219,400