INVESTMENT IN REAL ESTATE PROPERTIES - Real Estate Properties Held for Investment (Details) $ in Thousands	Sep. 30, 2020 USD ($) bed facility	Dec. 31, 2019 USD ($) bed facility
Real Estate Properties [Line Items]
Building and improvements	$ 5,107,022	$ 5,042,435
Furniture and equipment	243,265	239,229
Land improvements	1,917	1,534
Land	594,282	597,385
Total Real Estate at Cost	5,946,486	5,880,583
Accumulated Depreciation	(640,214)	(539,213)
Total Real Estate Investments, Net	$ 5,306,272	$ 5,341,370
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	425	429
Number of Beds/Units \| bed	42,378	43,112
Total Real Estate at Cost	$ 5,945,669	$ 5,879,846
Accumulated Depreciation	(639,812)	(538,860)
Total Real Estate Investments, Net	$ 5,305,857	5,340,986
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| facility	47
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	$ 817	737
Accumulated Depreciation	(402)	(353)
Total Real Estate Investments, Net	$ 415	$ 384
Skilled Nursing/Transitional Care \| Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	287	296
Number of Beds/Units \| bed	32,019	33,290
Total Real Estate at Cost	$ 3,642,653	$ 3,701,666
Accumulated Depreciation	(360,742)	(306,565)
Total Real Estate Investments, Net	$ 3,281,911	$ 3,395,101
Senior Housing - Leased \| Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	64	62
Number of Beds/Units \| bed	4,242	3,820
Total Real Estate at Cost	$ 707,379	$ 630,688
Accumulated Depreciation	(83,105)	(72,278)
Total Real Estate Investments, Net	$ 624,274	$ 558,410
Senior Housing - Managed \| Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	47	46
Number of Beds/Units \| bed	4,924	4,809
Total Real Estate at Cost	$ 931,655	$ 907,771
Accumulated Depreciation	(134,056)	(112,893)
Total Real Estate Investments, Net	$ 797,599	$ 794,878
Specialty Hospitals and Other \| Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	27	25
Number of Beds/Units \| bed	1,193	1,193
Total Real Estate at Cost	$ 663,982	$ 639,721
Accumulated Depreciation	(61,909)	(47,124)
Total Real Estate Investments, Net	$ 602,073	$ 592,597

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 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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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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