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Related Party Transactions (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
board_member
property
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
senior_housing
Related party transaction          
Number of real estate properties | property 1,200        
Ardent subsidiary          
Related party transaction          
Marketable Securities | $       $ 200,000,000.0  
Offering price, percentage of par value       98.60%  
Effective interest rate on investment       10.00%  
Ardent          
Related party transaction          
Ownership interests in properties accounted for under the equity method 9.80%        
Number of board members appointed 1        
Number of board members 11        
Elmcroft Senior Living          
Related party transaction          
Derecognition of straight line rent receivable | $         $ 75,200,000
Eclipse Senior Living          
Related party transaction          
Ownership interests in properties accounted for under the equity method 34.00%       34.00%
Number of board members appointed 2        
Number of board members 6        
Business Acquisition, Transaction Costs | $ $ 5,200,000 $ 8,200,000 $ 23,600,000    
Business combination consideration transferred | $ $ 0        
Remaining ownership percentage retained by investee 66.00%        
Ardent | Triple-net leased properties          
Related party transaction          
Number of real estate properties | property 11        
Ardent          
Related party transaction          
Number of board members appointed 1        
Number of board members 11        
Atria          
Related party transaction          
Ownership interests in properties accounted for under the equity method 34.00%        
Number of board members appointed 2        
Number of board members 6        
Atria          
Related party transaction          
Related party fees | $ $ 55,200,000 62,100,000 60,100,000    
Ardent          
Related party transaction          
Revenue from related parties | $ 122,600,000 118,800,000 114,800,000    
Eclipse Senior Living (ESL)          
Related party transaction          
Related party fees | $ $ 15,100,000 $ 14,600,000 $ 12,900,000    
Eclipse Senior Living | Seniors Housing Communities          
Related party transaction          
Number of real estate properties | senior_housing         76