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Intangibles - Narrative (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
Jan. 31, 2020
facility
Jan. 31, 2020
property
Oct. 31, 2019
property
Jan. 01, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]            
Weighted average remaining amortization period in years 6 years 5 years        
Weighted average remaining amortization period in years 8 years 7 years        
Intangible assets, net $ 501,583 $ 331,693        
Intangible liabilities, net 108,031 74,991        
Held-for-sale            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, held for sale 14,000 $ 11,000        
Accounting Standards Update 2016-12            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, net           $ 39,000
Intangible liabilities, net           $ 6,000
Brookedale MTCA            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets acquired 298,000          
Intangible liabilities acquired $ 42,000          
Weighted average remaining amortization period in years 7 years          
Weighted average remaining amortization period in years 10 years          
Brookedale MTCA | CCRC JV            
Finite-Lived Intangible Assets [Line Items]            
Property count | property       15    
Other non-reportable | CCRC JV | Assets Leased to Others            
Finite-Lived Intangible Assets [Line Items]            
Property count     15 15 15  
Other non-reportable | Brookedale MTCA | CCRC JV | Assets Leased to Others            
Finite-Lived Intangible Assets [Line Items]            
Property count 13   13 13