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CONCENTRATION OF CREDIT RISK - Senior Living Operations (Details)
1 Months Ended 9 Months Ended
Jan. 31, 2018
USD ($)
property
Sep. 30, 2018
USD ($)
board_member
property
Atria    
Concentration Risk    
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
Eclipse Senior Living    
Concentration Risk    
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
Number of properties managed by a third party | property 76  
Transaction costs | $   $ 20,900,000
Consideration transferred | $   $ 0
Remaining ownership percentage retained by investee   66.00%
Elmcroft Senior Living    
Concentration Risk    
Derecognition of straight line rent receivable | $ $ 75,200,000  
Derecognition of straight line rent receivable offsetting reserve | $ $ 75,200,000  
Seniors Housing Communities    
Concentration Risk    
Number of independent third party managed properties | property   360
Seniors Housing Communities | Atria and Sunrise    
Concentration Risk    
Number of independent third party managed properties | property   265