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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Lease term (in years)	10 years		10 years
Advertising expense	$ 1,805	$ 1,772	$ 5,545	$ 5,345
Unrealized gains and losses on available-for-sale debt securities			$ 0
Number of reportable segments \| segment			1
Accounts Receivable \| Customer Concentration Risk \| Medicare
Property, Plant and Equipment [Line Items]
Concentration risk (as in percent)			20.00%		20.00%
Accounts Receivable \| Customer Concentration Risk \| Medicaid
Property, Plant and Equipment [Line Items]
Concentration risk (as in percent)			39.00%		36.00%
Skilled Nursing Beds \| Geographic Concentration Risk \| CALIFORNIA
Property, Plant and Equipment [Line Items]
Concentration risk (as in percent)			57.00%
Buildings and improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	30 years		30 years
Minimum
Property, Plant and Equipment [Line Items]
Renewal term (in years)	3 years		3 years
Minimum \| Buildings and improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years		5 years
Minimum \| Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years		5 years
Minimum \| Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years		3 years
Maximum
Property, Plant and Equipment [Line Items]
Renewal term (in years)	20 years		20 years
Maximum \| Buildings and improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	40 years		40 years
Maximum \| Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years		15 years
Maximum \| Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years		15 years