INVESTMENT IN REAL ESTATE PROPERTIES - Real Estate Properties Held for Investment (Details) $ in Thousands	Sep. 30, 2022 USD ($) facility bed	Dec. 31, 2021 USD ($) facility bed
Real Estate Properties [Line Items]
Building and improvements	$ 5,061,024	$ 5,145,096
Furniture and equipment	262,323	262,969
Land improvements	4,663	4,295
Land	573,648	581,848
Total Real Estate at Cost	5,901,658	5,994,208
Accumulated Depreciation	(882,755)	(831,324)
Total Real Estate Investments, Net	$ 5,018,903	$ 5,162,884
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	407	416
Number of Beds/Units \| bed	41,053	41,346
Total Real Estate at Cost	$ 5,900,771	$ 5,993,345
Accumulated Depreciation	(882,224)	(830,857)
Total Real Estate Investments, Net	$ 5,018,547	$ 5,162,488
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| facility	270	279
Number of Beds/Units \| bed	30,205	30,920
Total Real Estate at Cost	$ 3,438,590	$ 3,617,359
Accumulated Depreciation	(476,998)	(474,534)
Total Real Estate Investments, Net	$ 2,961,592	$ 3,142,825
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| facility	52	60
Number of Beds/Units \| bed	3,822	4,099
Total Real Estate at Cost	$ 673,346	$ 720,581
Accumulated Depreciation	(107,557)	(104,046)
Total Real Estate Investments, Net	$ 565,789	$ 616,535
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| facility	54	49
Number of Beds/Units \| bed	5,669	5,140
Total Real Estate at Cost	$ 1,115,965	$ 1,012,398
Accumulated Depreciation	(201,278)	(174,098)
Total Real Estate Investments, Net	$ 914,687	$ 838,300
Operating Segments \| Behavioral Health
Real Estate Properties [Line Items]
Number of Properties \| facility	16	13
Number of Beds/Units \| bed	965	795
Total Real Estate at Cost	$ 447,427	$ 417,659
Accumulated Depreciation	(55,706)	(41,556)
Total Real Estate Investments, Net	$ 391,721	$ 376,103
Operating Segments \| Specialty Hospitals and Other
Real Estate Properties [Line Items]
Number of Properties \| facility	15	15
Number of Beds/Units \| bed	392	392
Total Real Estate at Cost	$ 225,443	$ 225,348
Accumulated Depreciation	(40,685)	(36,623)
Total Real Estate Investments, Net	184,758	188,725
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	887	863
Accumulated Depreciation	(531)	(467)
Total Real Estate Investments, Net	$ 356	$ 396

Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation and depletion of additions or improvements to real estate held for productive use. Examples include, but are not limited to, walkways, driveways, fences, and parking lots.

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The number of real estate properties owned as of the balance sheet date.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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