REAL ESTATE PROPERTIES HELD FOR INVESTMENT - Real Estate Properties Held for Investment (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) Bed Property Facilitiy	Dec. 31, 2016 USD ($) Bed Facilitiy
Real Estate Properties [Line Items]
Building and improvements	$ 5,449,415	$ 1,983,769
Furniture and equipment	232,889	85,196
Land improvements	3,456	3,744
Land	649,095	220,042
Total Real Estate at Cost	6,334,855	2,292,751
Accumulated Depreciation	(340,423)	(282,812)
Total Real Estate Investments, Net	$ 5,994,432	$ 2,009,939
Number of units transitioned to managed property structure \| Property	9
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	507	183
Number of Beds/Units \| Bed	53,558	18,878
Total Real Estate at Cost	$ 6,334,262	$ 2,292,345
Accumulated Depreciation	(340,154)	(282,556)
Total Real Estate Investments, Net	$ 5,994,108	$ 2,009,789
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	384	97
Number of Beds/Units \| Bed	43,223	10,819
Total Real Estate at Cost	$ 4,364,387	$ 1,042,754
Accumulated Depreciation	(209,039)	(190,038)
Total Real Estate Investments, Net	$ 4,155,348	$ 852,716
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	88	83
Number of Beds/Units \| Bed	8,137	7,855
Total Real Estate at Cost	$ 1,166,687	$ 1,153,739
Accumulated Depreciation	(102,370)	(80,449)
Total Real Estate Investments, Net	$ 1,064,317	$ 1,073,290
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	13	2
Number of Beds/Units \| Bed	1,113	134
Total Real Estate at Cost	$ 189,120	$ 34,212
Accumulated Depreciation	(12,125)	(1,682)
Total Real Estate Investments, Net	$ 176,995	$ 32,530
Operating Segments \| Specialty Hospitals and Other
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	22	1
Number of Beds/Units \| Bed	1,085	70
Total Real Estate at Cost	$ 614,068	$ 61,640
Accumulated Depreciation	(16,620)	(10,387)
Total Real Estate Investments, Net	597,448	51,253
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	593	406
Accumulated Depreciation	(269)	(256)
Total Real Estate Investments, Net	$ 324	$ 150

Number of Real Estate Properties Transitioned

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765

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-Publisher FASB
-Name Accounting Standards Codification
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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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
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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.

+ References

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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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