INVESTMENT IN REAL ESTATE PROPERTIES - Real Estate Properties Held for Investment (Details) $ in Thousands	Jun. 30, 2025 USD ($) facility bed	Dec. 31, 2024 USD ($) bed facility
Real Estate Properties [Line Items]
Building and improvements	$ 4,893,002	$ 4,853,151
Furniture and equipment	208,653	207,265
Land improvements	11,973	11,813
Land	543,040	543,535
Total Real Estate at Cost	5,656,668	5,615,764
Accumulated Depreciation	(1,177,377)	(1,102,030)
Total Real Estate Investments, Net	$ 4,479,291	$ 4,513,734
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	359	364
Number of Beds/Units \| bed	36,553	37,047
Total Real Estate at Cost	$ 5,653,888	$ 5,613,018
Accumulated Depreciation	(1,176,393)	(1,101,237)
Total Real Estate Investments, Net	$ 4,477,495	$ 4,511,781
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| facility	219	224
Number of Beds/Units \| bed	24,756	25,492
Total Real Estate at Cost	$ 2,890,238	$ 2,926,349
Accumulated Depreciation	(619,533)	(588,107)
Total Real Estate Investments, Net	$ 2,270,705	$ 2,338,242
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| facility	36	39
Number of Beds/Units \| bed	3,260	3,319
Total Real Estate at Cost	$ 502,425	$ 508,586
Accumulated Depreciation	(106,553)	(102,111)
Total Real Estate Investments, Net	$ 395,872	$ 406,475
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| facility	73	69
Number of Beds/Units \| bed	6,981	6,680
Total Real Estate at Cost	$ 1,559,372	$ 1,474,267
Accumulated Depreciation	(308,230)	(278,328)
Total Real Estate Investments, Net	$ 1,251,142	$ 1,195,939
Operating Segments \| Behavioral Health
Real Estate Properties [Line Items]
Number of Properties \| facility	16	17
Number of Beds/Units \| bed	1,164	1,164
Total Real Estate at Cost	$ 476,355	$ 478,318
Accumulated Depreciation	(86,495)	(79,819)
Total Real Estate Investments, Net	$ 389,860	$ 398,499
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	$ 225,498
Accumulated Depreciation	(55,582)	(52,872)
Total Real Estate Investments, Net	169,916	172,626
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	2,780	2,746
Accumulated Depreciation	(984)	(793)
Total Real Estate Investments, Net	$ 1,796	$ 1,953

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

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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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-Name Accounting Standards Codification
-Section S99
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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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