INVESTMENT IN REAL ESTATE PROPERTIES - Real Estate Properties Held for Investment (Details) $ in Thousands	Mar. 31, 2022 USD ($) bed facility	Dec. 31, 2021 USD ($) facility bed
Real Estate Properties [Line Items]
Building and improvements	$ 5,175,057	$ 5,145,096
Furniture and equipment	265,312	262,969
Land improvements	4,003	4,295
Land	585,483	581,848
Total Real Estate at Cost	6,029,855	5,994,208
Accumulated Depreciation	(873,795)	(831,324)
Total Real Estate Investments, Net	$ 5,156,060	$ 5,162,884
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	416	416
Number of Beds/Units \| bed	41,445	41,346
Total Real Estate at Cost	$ 6,028,982	$ 5,993,345
Accumulated Depreciation	(873,308)	(830,857)
Total Real Estate Investments, Net	$ 5,155,674	$ 5,162,488
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| facility	279	279
Number of Beds/Units \| bed	30,920	30,920
Total Real Estate at Cost	$ 3,623,501	$ 3,617,359
Accumulated Depreciation	(499,510)	(474,534)
Total Real Estate Investments, Net	$ 3,123,991	$ 3,142,825
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| facility	59	60
Number of Beds/Units \| bed	4,072	4,099
Total Real Estate at Cost	$ 718,178	$ 720,581
Accumulated Depreciation	(108,364)	(104,046)
Total Real Estate Investments, Net	$ 609,814	$ 616,535
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| facility	50	49
Number of Beds/Units \| bed	5,266	5,140
Total Real Estate at Cost	$ 1,043,235	$ 1,012,398
Accumulated Depreciation	(183,148)	(174,098)
Total Real Estate Investments, Net	$ 860,087	$ 838,300
Operating Segments \| Behavioral Health
Real Estate Properties [Line Items]
Number of Properties \| facility	13	13
Number of Beds/Units \| bed	795	795
Total Real Estate at Cost	$ 418,625	$ 417,659
Accumulated Depreciation	(44,309)	(41,556)
Total Real Estate Investments, Net	$ 374,316	$ 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	(37,977)	(36,623)
Total Real Estate Investments, Net	187,466	188,725
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	873	863
Accumulated Depreciation	(487)	(467)
Total Real Estate Investments, Net	$ 386	$ 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 depreciation of fixtures and equipment. Includes, but is not limited to, machinery, equipment, and engines.

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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 deprecation 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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