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Acquisitions, Dispositions and Other Significant Transactions - Ventas Lease Portfolio Restructuring (Details)
 3 Months Ended 12 Months Ended
Apr. 26, 2018
USD ($)
community
extension_option
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
community
lease
Dec. 31, 2019
USD ($)
community
Dec. 31, 2018
USD ($)
Jul. 26, 2020
extension_option
Jan. 01, 2019
Business Acquisition [Line Items]              
Number of communities leased | lease     235        
Loss on facility lease termination and modification, net     $ (2,303,000) $ 3,388,000 $ 162,001,000    
Ventas, Inc              
Business Acquisition [Line Items]              
Number of extensions | extension_option           2  
Ventas, Inc | Master Lease And Security Agreement              
Business Acquisition [Line Items]              
Number of communities leased | community 128            
Prior number of communities | community 107            
Additional number of communities | community 21            
Number of extensions | extension_option 2            
Extension term     10 years        
Rent expense         175,000,000.0    
Rent credit   $ 8,000,000.0 $ 7,000,000.0 $ 8,000,000.0 $ 8,000,000.0    
Base rent escalator, CPI increase             2.25%
Base rent escalator, CPI increase multiplier             4
Base rent escalator, CPI decrease             0.00%
Investment minimum, unit per lease $ 2,000            
Period of lease 24 months            
Investment in capital improvements $ 30,000,000.0            
Payment for change of control fees $ 25,000,000.0            
Number of communities exercised to market for sale and sold | community     1 7      
Reduction of rent for terminating communities     $ 100,000 $ 1,700,000      
Loss on facility lease termination and modification, net   $ (125,700,000)