DISPOSITIONS AND IMPAIRMENTS - Real Estate Assets Held For Sale (Details) $ in Thousands	Mar. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	1,200
Assets held for sale	$ 20,233	$ 44,893
Liabilities related to assets held for sale	4,412	6,492
SHOP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	20,209	44,852
Liabilities related to assets held for sale	$ 3,557	5,675
Office Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	373
Assets held for sale	$ 24	41
Liabilities related to assets held for sale	$ 855	$ 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	2	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	2	3
Disposal Group, Held-for-sale, Not Discontinued Operations | Office Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Properties Held for Sale | property	0	0