INVESTMENT IN REAL ESTATE PROPERTIES - Real Estate Properties Held for Investment (Details) $ in Thousands	Jun. 30, 2026 USD ($) bed property	Dec. 31, 2025 USD ($) bed property
Real Estate Properties [Line Items]
Land	$ 604,201	$ 579,586
Land improvements	12,668	11,987
Building and improvements	5,285,430	5,107,100
Furniture and equipment	210,935	202,067
Construction in progress	16,578	10,300
Total Real Estate at Cost	6,129,812	5,911,040
Accumulated Depreciation	(1,297,557)	(1,224,663)
Total Real Estate Investments, Net	$ 4,832,255	$ 4,686,377
Real Estate Properties, Excluding Corporate Level
Real Estate Properties [Line Items]
Number of Properties \| property	364	360
Number of Beds/Units \| bed	37,043	36,412
Total Real Estate at Cost	$ 6,127,306	$ 5,908,729
Accumulated Depreciation	(1,296,818)	(1,224,069)
Total Real Estate Investments, Net	$ 4,830,488	$ 4,684,660
Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| property	207	210
Number of Beds/Units \| bed	23,124	23,537
Total Real Estate at Cost	$ 2,819,686	$ 2,802,561
Accumulated Depreciation	(662,018)	(635,685)
Total Real Estate Investments, Net	$ 2,157,668	$ 2,166,876
Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| property	32	32
Number of Beds/Units \| bed	2,623	2,668
Total Real Estate at Cost	$ 360,736	$ 376,590
Accumulated Depreciation	(87,835)	(90,236)
Total Real Estate Investments, Net	$ 272,901	$ 286,354
Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| property	94	87
Number of Beds/Units \| bed	9,745	8,677
Total Real Estate at Cost	$ 2,247,573	$ 2,030,267
Accumulated Depreciation	(388,860)	(349,213)
Total Real Estate Investments, Net	$ 1,858,713	$ 1,681,054
Behavioral Health
Real Estate Properties [Line Items]
Number of Properties \| property	16	16
Number of Beds/Units \| bed	1,159	1,138
Total Real Estate at Cost	$ 473,813	$ 473,813
Accumulated Depreciation	(97,126)	(90,644)
Total Real Estate Investments, Net	$ 376,687	$ 383,169
Specialty Hospitals and Other
Real Estate Properties [Line Items]
Number of Properties \| property	15	15
Number of Beds/Units \| bed	392	392
Total Real Estate at Cost	$ 225,498	$ 225,498
Accumulated Depreciation	(60,979)	(58,291)
Total Real Estate Investments, Net	164,519	167,207
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	2,506	2,311
Accumulated Depreciation	(739)	(594)
Total Real Estate Investments, Net	$ 1,767	$ 1,717

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 of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-2

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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
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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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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