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Related Party Transactions (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
property
Dec. 31, 2019
USD ($)
property
board_member
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Related party transaction        
Number of real estate properties | property   1,200    
Atria        
Related party transaction        
Ownership interests in properties accounted for under the equity method   34.00%    
Number of board members appointed | board_member   2    
Number of board members | board_member   6    
Ardent        
Related party transaction        
Ownership interests in properties accounted for under the equity method   9.80%    
Number of board members appointed | board_member   1    
Number of board members | board_member   11    
Elmcroft Senior Living        
Related party transaction        
Derecognition of straight line rent receivable $ 75,200,000      
Derecognition of straight line rent receivable offsetting reserve 75,200,000      
Eclipse Senior Living        
Related party transaction        
Ownership interests in properties accounted for under the equity method   34.00%    
Number of board members appointed | board_member   2    
Number of board members | board_member   6    
Transaction costs   $ 8,200,000 $ 23,600,000  
Consideration transferred $ 0      
Remaining ownership percentage retained by investee   66.00%    
Eclipse Senior Living        
Related party transaction        
Related party fees   $ 14,600,000 12,900,000  
Eclipse Senior Living | Seniors Housing Communities        
Related party transaction        
Number of real estate properties | property 76      
Atria        
Related party transaction        
Related party fees   62,100,000 60,100,000 $ 59,700,000
Ardent        
Related party transaction        
Revenue from related parties   $ 118,800,000 $ 114,800,000 $ 110,800,000
Ardent | Triple Net Leased Properties        
Related party transaction        
Number of real estate properties | property   10