REAL ESTATE PROPERTIES HELD FOR INVESTMENT - Summary of Revenue by External Customers (Details) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($) Facilitiy	Mar. 31, 2016 USD ($)
Concentration Risk [Line Items]
Rental Revenue	$ 62,650	$ 62,559
Genesis Healthcare, Inc. [Member]
Concentration Risk [Line Items]
Number of Investments \| Facilitiy	78
Rental Revenue	$ 19,955
Holiday AL Holdings, LP [Member]
Concentration Risk [Line Items]
Number of Investments \| Facilitiy	21
Rental Revenue	$ 9,813
NMS Healthcare [Member]
Concentration Risk [Line Items]
Number of Investments \| Facilitiy	5
Rental Revenue	$ 7,505
Rental Revenue [Member] \| Customer Concentration Risk [Member] \| Genesis Healthcare, Inc. [Member]
Concentration Risk [Line Items]
% of Total Revenue	31.90%
Rental Revenue [Member] \| Customer Concentration Risk [Member] \| Holiday AL Holdings, LP [Member]
Concentration Risk [Line Items]
% of Total Revenue	15.70%
Rental Revenue [Member] \| Customer Concentration Risk [Member] \| NMS Healthcare [Member]
Concentration Risk [Line Items]
% of Total Revenue	12.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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The number of real estate properties owned as of the balance sheet date.

+ References

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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