INVESTMENT IN REAL ESTATE PROPERTIES - Real Estate Properties Held for Investment (Details) $ in Thousands	Jun. 30, 2021 USD ($) facility bed	Dec. 31, 2020 USD ($) facility bed
Real Estate Properties [Line Items]
Building and improvements	$ 5,178,684	$ 5,120,598
Furniture and equipment	255,018	249,034
Land improvements	2,940	2,220
Land	596,635	594,843
Total Real Estate at Cost	6,033,277	5,966,695
Accumulated Depreciation	(763,830)	(681,657)
Total Real Estate Investments, Net	$ 5,269,447	$ 5,285,038
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	423	426
Number of Beds/Units \| bed	41,836	42,059
Total Real Estate at Cost	$ 6,032,460	$ 5,965,893
Accumulated Depreciation	(763,390)	(681,253)
Total Real Estate Investments, Net	$ 5,269,070	$ 5,284,640
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| facility	283	287
Number of Beds/Units \| bed	31,321	31,761
Total Real Estate at Cost	$ 3,631,838	$ 3,644,470
Accumulated Depreciation	(431,976)	(385,094)
Total Real Estate Investments, Net	$ 3,199,862	$ 3,259,376
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| facility	62	65
Number of Beds/Units \| bed	4,147	4,282
Total Real Estate at Cost	$ 705,048	$ 707,634
Accumulated Depreciation	(97,319)	(87,600)
Total Real Estate Investments, Net	$ 607,729	$ 620,034
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| facility	49	47
Number of Beds/Units \| bed	5,140	4,924
Total Real Estate at Cost	$ 1,008,080	$ 942,996
Accumulated Depreciation	(158,946)	(142,538)
Total Real Estate Investments, Net	$ 849,134	$ 800,458
Operating Segments \| Specialty Hospitals and Other
Real Estate Properties [Line Items]
Number of Properties \| facility	29	27
Number of Beds/Units \| bed	1,228	1,092
Total Real Estate at Cost	$ 687,494	$ 670,793
Accumulated Depreciation	(75,149)	(66,021)
Total Real Estate Investments, Net	612,345	604,772
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	817	802
Accumulated Depreciation	(440)	(404)
Total Real Estate Investments, Net	$ 377	$ 398

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 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 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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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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