INVESTMENT IN REAL ESTATE PROPERTIES - Real Estate Properties Held for Investment (Details) $ in Thousands	Sep. 30, 2024 USD ($) facility bed	Dec. 31, 2023 USD ($) bed facility
Real Estate Properties [Line Items]
Building and improvements	$ 4,897,747	$ 4,843,258
Furniture and equipment	243,226	238,185
Land improvements	10,919	10,306
Land	547,846	546,598
Total Real Estate at Cost	5,699,738	5,638,347
Accumulated Depreciation	(1,125,470)	(1,021,086)
Total Real Estate Investments, Net	$ 4,574,268	$ 4,617,261
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	373	378
Number of Beds/Units \| bed	37,793	37,834
Total Real Estate at Cost	$ 5,696,773	$ 5,635,800
Accumulated Depreciation	(1,124,588)	(1,020,454)
Total Real Estate Investments, Net	$ 4,572,185	$ 4,615,346
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| facility	233	241
Number of Beds/Units \| bed	26,330	26,769
Total Real Estate at Cost	$ 2,992,712	$ 3,050,861
Accumulated Depreciation	(586,817)	(535,653)
Total Real Estate Investments, Net	$ 2,405,895	$ 2,515,208
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| facility	39	43
Number of Beds/Units \| bed	3,319	3,473
Total Real Estate at Cost	$ 512,037	$ 573,274
Accumulated Depreciation	(102,191)	(109,601)
Total Real Estate Investments, Net	$ 409,846	$ 463,673
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| facility	68	61
Number of Beds/Units \| bed	6,588	6,041
Total Real Estate at Cost	$ 1,487,337	$ 1,289,485
Accumulated Depreciation	(307,545)	(255,803)
Total Real Estate Investments, Net	$ 1,179,792	$ 1,033,682
Operating Segments \| Behavioral Health
Real Estate Properties [Line Items]
Number of Properties \| facility	18	18
Number of Beds/Units \| bed	1,164	1,159
Total Real Estate at Cost	$ 479,189	$ 496,737
Accumulated Depreciation	(76,518)	(71,943)
Total Real Estate Investments, Net	$ 402,671	$ 424,794
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	$ 225,498	$ 225,443
Accumulated Depreciation	(51,517)	(47,454)
Total Real Estate Investments, Net	173,981	177,989
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	2,965	2,547
Accumulated Depreciation	(882)	(632)
Total Real Estate Investments, Net	$ 2,083	$ 1,915

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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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 number of units in a real estate property 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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