INVESTMENT IN REAL ESTATE PROPERTIES - Real Estate Properties Held for Investment (Details) $ in Thousands	Sep. 30, 2023 USD ($) bed facility	Dec. 31, 2022 USD ($) facility bed
Real Estate Properties [Line Items]
Building and improvements	$ 4,815,199	$ 5,034,470
Furniture and equipment	234,882	262,644
Land improvements	10,241	7,085
Land	545,176	568,489
Total Real Estate at Cost	5,605,498	5,872,688
Accumulated Depreciation	(1,002,484)	(913,345)
Total Real Estate Investments, Net	$ 4,603,014	$ 4,959,343
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	377	402
Number of Beds/Units \| bed	37,606	39,985
Total Real Estate at Cost	$ 5,603,895	$ 5,871,784
Accumulated Depreciation	(1,001,879)	(912,819)
Total Real Estate Investments, Net	$ 4,602,016	$ 4,958,965
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| facility	240	264
Number of Beds/Units \| bed	26,623	29,136
Total Real Estate at Cost	$ 3,035,231	$ 3,385,221
Accumulated Depreciation	(530,290)	(492,495)
Total Real Estate Investments, Net	$ 2,504,941	$ 2,892,726
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| facility	43	47
Number of Beds/Units \| bed	3,473	3,550
Total Real Estate at Cost	$ 572,633	$ 590,694
Accumulated Depreciation	(106,063)	(97,716)
Total Real Estate Investments, Net	$ 466,570	$ 492,978
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| facility	61	59
Number of Beds/Units \| bed	6,041	5,942
Total Real Estate at Cost	$ 1,278,352	$ 1,205,283
Accumulated Depreciation	(250,772)	(222,089)
Total Real Estate Investments, Net	$ 1,027,580	$ 983,194
Operating Segments \| Behavioral Health
Real Estate Properties [Line Items]
Number of Properties \| facility	18	17
Number of Beds/Units \| bed	1,077	965
Total Real Estate at Cost	$ 492,236	$ 465,143
Accumulated Depreciation	(68,654)	(58,481)
Total Real Estate Investments, Net	$ 423,582	$ 406,662
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	$ 225,443
Accumulated Depreciation	(46,100)	(42,038)
Total Real Estate Investments, Net	179,343	183,405
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	1,603	904
Accumulated Depreciation	(605)	(526)
Total Real Estate Investments, Net	$ 998	$ 378

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
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-Section S99
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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
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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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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