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DISPOSITIONS AND IMPAIRMENTS - Assets Held For Sale and Impairment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	$ 44,893	$ 28,399
Liabilities Held for Sale	6,492	10,850
SHOP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	44,852	24,964
Liabilities Held for Sale	5,675	9,321
Office operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	41	3,435
Liabilities Held for Sale	817	1,529
Triple-net leased properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held for Sale	0	0
Liabilities Held for Sale	$ 0	$ 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	3	4
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	3	2
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	2
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	0	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	$ 107,800	$ 219,400	$ 153,800