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CONCENTRATION OF CREDIT RISK (Details)
6 Months Ended
Jun. 30, 2017
board_member
property
state
province
Atria  
Concentration Risk [Line Items]  
Ownership interests accounted for under the equity method 34.00%
Number of board members appointed | board_member 2
Number of board members | board_member 6
Seniors Housing Communities  
Concentration Risk [Line Items]  
Number of seniors housing communities under long-term management agreements | property 301
Seniors Housing Communities | Atria and Sunrise  
Concentration Risk [Line Items]  
Number of seniors housing communities under long-term management agreements | property 269
NOI  
Concentration Risk [Line Items]  
Number of states accounting for more than 10% of operating income 1
Customer Concentration Risk  
Concentration Risk [Line Items]  
Number of states 46
Number of Canadian provinces | province 7
Customer Concentration Risk | Total gross book value of properties | Atria  
Concentration Risk [Line Items]  
Concentration percentage 21.90%
Customer Concentration Risk | Total gross book value of properties | Sunrise  
Concentration Risk [Line Items]  
Concentration percentage 10.90%
Customer Concentration Risk | Total gross book value of properties | Brookdale Senior Living  
Concentration Risk [Line Items]  
Concentration percentage 7.70%
Customer Concentration Risk | Total gross book value of properties | Ardent  
Concentration Risk [Line Items]  
Concentration percentage 4.90%
Customer Concentration Risk | Total gross book value of properties | Kindred  
Concentration Risk [Line Items]  
Concentration percentage 1.10%
Customer Concentration Risk | Total gross book value of properties | Hospitals, Medical Office Building, and Other  
Concentration Risk [Line Items]  
Concentration percentage 39.60%
Customer Concentration Risk | Total revenues  
Concentration Risk [Line Items]  
Number of states accounting for more than 10% of total revenues 1
Triple-Net Leased Properties | Customer Concentration Risk | Total gross book value of properties  
Concentration Risk [Line Items]  
Concentration percentage 25.10%
Senior Living Operations | Customer Concentration Risk | Total gross book value of properties  
Concentration Risk [Line Items]  
Concentration percentage 35.30%