DISPOSITIONS AND IMPAIRMENTS - Real Estate Assets Held For Sale (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) property	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) property	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	1,400		1,400
Assets held for sale	$ 43,191		$ 43,191		$ 44,893
Liabilities related to assets held for sale	5,098		5,098		6,492
Gain on real estate dispositions	10,711	$ 136	22,317	$ 2,557
SHOP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	41,108		41,108		44,852
Liabilities related to assets held for sale	$ 4,435		$ 4,435		5,675
Outpatient Medical and Research Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	461		461
Assets held for sale	$ 1,393		$ 1,393		41
Liabilities related to assets held for sale	520		520		817
Triple-Net Leased Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	690		690		0
Liabilities related to assets held for sale	$ 143		$ 143		$ 0
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	9		9		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	7		7		3
Disposal Group, Held-for-sale, Not Discontinued Operations | Outpatient Medical and Research Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	1		1		0
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		1		0