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CONCENTRATION OF CREDIT RISK - Narrative (Details) - Customer Concentration Risk
6 Months Ended
Jun. 30, 2018
state
province
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
Continuing revenues and NOI from properties located in California 10.00%
Total Gross Book Value of Properties | Hospitals, Medical Office Building, and Other  
Concentration Risk  
Concentration percentage 38.40%
Total Gross Book Value of Properties | Senior Living Operations  
Concentration Risk  
Concentration percentage 39.30%
Total Gross Book Value of Properties | Seniors Housing Communities | Triple-Net Leased Properties  
Concentration Risk  
Concentration percentage 22.30%
Atria | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 22.40%
Sunrise | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 11.20%
Brookdale Senior Living | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 7.70%
Ardent | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 5.10%
Kindred | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 1.10%