IMPAIRMENT OF REAL ESTATE INVESTMENTS, ASSETS HELD FOR SALE, NET AND ASSET SALES - Narrative (Details) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 30, 2024 USD ($) facility	Jun. 30, 2024 USD ($)	Dec. 31, 2022 USD ($) facility	Sep. 30, 2022 USD ($) facility	Dec. 31, 2024 USD ($) facility	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) facility	Aug. 01, 2024 facility	Jun. 29, 2023 facility	Jun. 01, 2023 facility	Dec. 31, 2020 facility
Real Estate [Line Items]
Impairment of real estate investments					$ 42,225	$ 36,301	$ 79,062
Number of facilities | facility					258					1
Real estate investment property, at cost					$ 2,705,522	2,005,077
Real estate investments, net					2,226,740	1,567,119
Financing Receivable, Seller Financing In Connection With Sale					1,000
ALF
Real Estate [Line Items]
Impairment of real estate investments		$ 4,400			$ 5,000
Number of facilities | facility					1
Real estate investment property, at cost					$ 5,000
SNF
Real Estate [Line Items]
Impairment of real estate investments						8,000	$ 1,700
Number of facilities | facility			1				1	37			9
Real estate investment property, at cost			$ 2,800			8,700	$ 2,800
Real estate investments, net			1,100			700	1,100
SNF | Mortgage secured loans receivable(4)
Real Estate [Line Items]
Number of facilities | facility									1
Independent Living Facilities | Mortgage secured loans receivable(4)
Real Estate [Line Items]
Number of facilities | facility									1
Level 3 | SNF
Real Estate [Line Items]
Prices per unit input			20			7	20
Level 3 | Facilities Held For Sale
Real Estate [Line Items]
Number of facilities | facility					10
Valuation, Market Approach | Level 3 | Minimum
Real Estate [Line Items]
Prices per unit input			20		$ 7	8	20
Valuation, Market Approach | Level 3 | Maximum
Real Estate [Line Items]
Prices per unit input			85		116	85	85
Valuation, Market Approach | Level 3 | Weighted Average
Real Estate [Line Items]
Prices per unit input			$ 55		60	20	55
Held for Sale
Real Estate [Line Items]
Impairment of real estate investments					18,800	26,800	14,400
Held For Investment
Real Estate [Line Items]
Impairment of real estate investments					9,400	8,000	19,700
Held For Investment | ALF
Real Estate [Line Items]
Impairment of real estate investments					4,400		$ 1,400
Number of facilities | facility	2		9	1			9
Real estate investment property, at cost			$ 50,800				$ 50,800
Amount transferred out of assets held-for-sale	$ 5,000		$ 47,800	$ 4,900
Held For Investment | Nine Assisted Living Facility
Real Estate [Line Items]
Impairment of real estate investments							$ 16,600
Held For Investment | Valuation, Market Approach | Level 3 | ALF
Real Estate [Line Items]
Prices per unit input	$ 45			$ 125
Held For Investment | Valuation Technique, Terminal Capitalization Rate | Level 3 | Minimum | ALF
Real Estate [Line Items]
Assets held-for-sale, measurement input			0.075				0.075
Held For Investment | Valuation Technique, Terminal Capitalization Rate | Level 3 | Maximum | ALF
Real Estate [Line Items]
Assets held-for-sale, measurement input			0.0875				0.0875
Held For Investment | Discounted cash flow | Level 3 | Minimum | ALF
Real Estate [Line Items]
Assets held-for-sale, measurement input			0.085				0.085
Held For Investment | Discounted cash flow | Level 3 | Maximum | ALF
Real Estate [Line Items]
Assets held-for-sale, measurement input			0.0975				0.0975
Disposed of by Sale
Real Estate [Line Items]
Impairment of real estate investments					$ 14,000	$ 1,500	$ 45,000