CONCENTRATION OF CREDIT RISK - Triple-Net Leased Properties (Details) - Customer Concentration Risk	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Revenues \| Brookdale Senior Living
Concentration Risk
Concentration percentage	4.90%	4.80%
Revenues \| Ardent
Concentration Risk
Concentration percentage	3.20%	3.10%
Revenues \| Kindred
Concentration Risk
Concentration percentage	3.50%	3.40%
NOI \| Brookdale Senior Living
Concentration Risk
Concentration percentage	10.40%	8.90%
NOI \| Ardent
Concentration Risk
Concentration percentage	6.80%	5.80%
NOI \| Kindred
Concentration Risk
Concentration percentage	7.40%	6.40%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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