REAL ESTATE PROPERTIES HELD FOR INVESTMENT - Real Estate Properties Held for Investment (Details) $ in Thousands	Mar. 31, 2018 USD ($) Bed Facilitiy	Dec. 31, 2017 USD ($) Bed Facilitiy
Real Estate Properties [Line Items]
Building and improvements	$ 5,576,282	$ 5,449,415
Furniture and equipment	240,869	232,889
Land improvements	3,507	3,456
Land	665,206	649,095
Total Real Estate at Cost	6,485,864	6,334,855
Accumulated Depreciation	(377,063)	(340,423)
Total Real Estate Investments, Net	$ 6,108,801	$ 5,994,432
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	515	507
Number of Beds/Units \| Bed	53,968	53,558
Total Real Estate at Cost	$ 6,485,231	$ 6,334,262
Accumulated Depreciation	(376,783)	(340,154)
Total Real Estate Investments, Net	$ 6,108,448	$ 5,994,108
Operating Segments \| Skilled Nursing/Transitional Care
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	380	384
Number of Beds/Units \| Bed	42,972	43,223
Total Real Estate at Cost	$ 4,384,312	$ 4,364,387
Accumulated Depreciation	(232,080)	(209,039)
Total Real Estate Investments, Net	$ 4,152,232	$ 4,155,348
Operating Segments \| Senior Housing - Leased
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	89	88
Number of Beds/Units \| Bed	8,167	8,137
Total Real Estate at Cost	$ 1,173,102	$ 1,166,687
Accumulated Depreciation	(110,342)	(102,370)
Total Real Estate Investments, Net	$ 1,062,760	$ 1,064,317
Operating Segments \| Senior Housing - Managed
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	24	13
Number of Beds/Units \| Bed	1,744	1,113
Total Real Estate at Cost	$ 310,377	$ 189,120
Accumulated Depreciation	(13,999)	(12,125)
Total Real Estate Investments, Net	$ 296,378	$ 176,995
Operating Segments \| Specialty Hospitals and Other
Real Estate Properties [Line Items]
Number of Properties \| Facilitiy	22	22
Number of Beds/Units \| Bed	1,085	1,085
Total Real Estate at Cost	$ 617,440	$ 614,068
Accumulated Depreciation	(20,362)	(16,620)
Total Real Estate Investments, Net	597,078	597,448
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	633	593
Accumulated Depreciation	(280)	(269)
Total Real Estate Investments, Net	$ 353	$ 324

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.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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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
-Section 45
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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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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-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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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