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CONCENTRATION OF CREDIT RISK - Narrative (Details)
3 Months Ended
Mar. 31, 2018
state
province
Concentration Risk  
Continuing revenues and NOI from properties located in California 10.00%
Customer Concentration Risk  
Concentration Risk  
Number of states in which entity operates 45
Number of Canadian provinces in which entity operates | province 7
Number of states accounting for more than 10% of total revenues and net operating income 1
Customer Concentration Risk | Total Gross Book Value of Properties | Hospitals, Medical Office Building, and Other  
Concentration Risk  
Concentration percentage 39.80%
Customer Concentration Risk | Total Gross Book Value of Properties | Senior Living Operations  
Concentration Risk  
Concentration percentage 38.40%
Customer Concentration Risk | Total Gross Book Value of Properties | Seniors Housing Communities | Triple-Net Leased Properties  
Concentration Risk  
Concentration percentage 21.80%
Customer Concentration Risk | Atria | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 21.80%
Customer Concentration Risk | Sunrise | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 10.90%
Customer Concentration Risk | Brookdale Senior Living | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 7.50%
Customer Concentration Risk | Ardent | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 4.90%
Customer Concentration Risk | Kindred | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 1.10%