CONCENTRATION OF CREDIT RISK (Schedule of Concentration Risks) (Details) - property	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017
Concentration Risk [Line Items]
Number of properties held for sale	14		14
Number of senior housing community included in senior living operations			1
Number of senior housing communities that is held for sale and included in continuing operations	1		1
Kindred | Revenues | Revenue from Rights Concentration Risk
Concentration Risk [Line Items]
Concentration percentage	4.70%	5.30%
Kindred | NOI | Revenue from Rights Concentration Risk
Concentration Risk [Line Items]
Concentration percentage	8.10%	9.10%
Brookdale Senior Living | Revenues | Revenue from Rights Concentration Risk
Concentration Risk [Line Items]
Concentration percentage	4.90%	4.80%
Brookdale Senior Living | NOI | Revenue from Rights Concentration Risk
Concentration Risk [Line Items]
Concentration percentage	8.40%	8.20%
Ardent | Revenues | Revenue from Rights Concentration Risk
Concentration Risk [Line Items]
Concentration percentage	3.10%	3.10%
Ardent | NOI | Revenue from Rights Concentration Risk
Concentration Risk [Line Items]
Concentration percentage	5.30%	5.30%