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CONCENTRATION OF CREDIT RISK - (Details) - Customer Concentration Risk
3 Months Ended
Mar. 31, 2019
state
province
Concentration Risk  
Number of states in which entity operates 45
Number of states accounting for more than 10% of total revenues and net operating income 1
Continuing revenues and NOI threshold 10.00%
CANADA  
Concentration Risk  
Number of Canadian provinces in which entity operates | province 7
Total Gross Book Value of Properties | Hospitals, Medical Office Building, and Other  
Concentration Risk  
Concentration percentage 38.50%
Total Gross Book Value of Properties | Seniors Housing Communities | Senior Living Operations  
Concentration Risk  
Concentration percentage 39.70%
Total Gross Book Value of Properties | Seniors Housing Communities | Triple-Net Leased Properties  
Concentration Risk  
Concentration percentage 21.80%
Atria | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 22.30%
Sunrise | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 11.00%
Brookdale Senior Living | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 8.40%
Ardent | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 5.10%
Eclipse Senior Living | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 3.90%
Kindred | Total Gross Book Value of Properties  
Concentration Risk  
Concentration percentage 1.10%