REAL ESTATE PROPERTIES HELD FOR INVESTMENT - Real Estate Properties Held for Investment (Details) $ in Thousands	9 Months Ended
Sep. 30, 2019 USD ($) Bed facility	Dec. 31, 2018 USD ($) Bed facility
Real Estate Properties [Line Items]
Building and improvements	$ 5,018,346	$ 5,388,102
Furniture and equipment	235,762	237,145
Land improvements	1,415	1,254
Land	592,251	629,382
Total Real Estate at Cost	5,847,774	6,255,883
Accumulated Depreciation	(502,777)	(402,338)
Total Real Estate Investments, Net	$ 5,344,997	$ 5,853,545
Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	434	470
Number of Beds/Units \| Bed	43,553	47,648
Total Real Estate at Cost	$ 5,847,033	$ 6,255,249
Accumulated Depreciation	(502,426)	(402,021)
Total Real Estate Investments, Net	5,344,607	5,853,228
Corporate Level
Real Estate Properties [Line Items]
Total Real Estate at Cost	741	634
Accumulated Depreciation	(351)	(317)
Total Real Estate Investments, Net	$ 390	$ 317
Skilled Nursing/Transitional Care \| Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	304	335
Number of Beds/Units \| Bed	33,879	37,628
Total Real Estate at Cost	$ 3,711,702	$ 4,094,484
Accumulated Depreciation	(285,138)	(224,942)
Total Real Estate Investments, Net	$ 3,426,564	$ 3,869,542
Senior Housing - Leased \| Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	62	90
Number of Beds/Units \| Bed	4,011	7,332
Total Real Estate at Cost	$ 636,273	$ 1,237,790
Accumulated Depreciation	(72,716)	(125,902)
Total Real Estate Investments, Net	$ 563,557	$ 1,111,888
Senior Housing - Managed
Real Estate Properties [Line Items]
Number of senior housing communities transferred into portfolio \| facility	21
Senior Housing - Managed \| Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	44	23
Number of Beds/Units \| Bed	4,470	1,603
Total Real Estate at Cost	$ 863,130	$ 301,739
Accumulated Depreciation	(101,426)	(19,537)
Total Real Estate Investments, Net	$ 761,704	$ 282,202
Specialty Hospitals and Other \| Operating Segments
Real Estate Properties [Line Items]
Number of Properties \| facility	24	22
Number of Beds/Units \| Bed	1,193	1,085
Total Real Estate at Cost	$ 635,928	$ 621,236
Accumulated Depreciation	(43,146)	(31,640)
Total Real Estate Investments, Net	$ 592,782	$ 589,596

Number Of Real Estate Properties Transferred In Period

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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.

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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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