REAL ESTATE PROPERTIES HELD FOR INVESTMENT - Real Estate Properties Held for Investment (Details) $ in Thousands	Dec. 31, 2019 USD ($) Bed facility	Dec. 31, 2018 USD ($) Bed facility
Real Estate Properties [Line Items]
Building and improvements	$ 5,042,435	$ 5,388,102
Furniture and equipment	239,229	237,145
Land improvements	1,534	1,254
Land	597,385	629,382
Total Real Estate at Cost	5,880,583	6,255,883
Accumulated Depreciation	(539,213)	(402,338)
Total Real Estate Investments, Net	$ 5,341,370	$ 5,853,545
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	429	470
Number of Beds/Units \| Bed	43,112	47,648
Total Real Estate at Cost	$ 5,879,846	$ 6,255,249
Accumulated Depreciation	(538,860)	(402,021)
Total Real Estate Investments, Net	$ 5,340,986	$ 5,853,228
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| facility	296	335
Number of Beds/Units \| Bed	33,290	37,628
Total Real Estate at Cost	$ 3,701,666	$ 4,094,484
Accumulated Depreciation	(306,565)	(224,942)
Total Real Estate Investments, Net	$ 3,395,101	$ 3,869,542
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| facility	62	90
Number of Beds/Units \| Bed	3,820	7,332
Total Real Estate at Cost	$ 630,688	$ 1,237,790
Accumulated Depreciation	(72,278)	(125,902)
Total Real Estate Investments, Net	$ 558,410	$ 1,111,888
Operating Segments \| Senior Housing Facilities - Managed Portfolio
Real Estate Properties [Line Items]
Number of Properties \| facility	46	23
Number of Beds/Units \| Bed	4,809	1,603
Total Real Estate at Cost	$ 907,771	$ 301,739
Accumulated Depreciation	(112,893)	(19,537)
Total Real Estate Investments, Net	$ 794,878	$ 282,202
Operating Segments \| Specialty Hospitals and Other
Real Estate Properties [Line Items]
Number of Properties \| facility	25	22
Number of Beds/Units \| Bed	1,193	1,085
Total Real Estate at Cost	$ 639,721	$ 621,236
Accumulated Depreciation	(47,124)	(31,640)
Total Real Estate Investments, Net	592,597	589,596
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	737	634
Accumulated Depreciation	(353)	(317)
Total Real Estate Investments, Net	$ 384	$ 317

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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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 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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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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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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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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