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INVESTMENT IN REAL ESTATE PROPERTIES - Investment in Unconsolidated Joint Venture (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
Jan. 02, 2018
Real Estate [Line Items]      
Investment in unconsolidated joint venture $ 293,801 $ 319,460  
Enlivant Joint Venture      
Real Estate [Line Items]      
Equity interest in joint venture 49.00%   49.00%
Investment in unconsolidated joint venture $ 293,800    
Senior Housing Facilities | Enlivant Joint Venture      
Real Estate [Line Items]      
Aggregate net loss on sale of real estate $ 3,300    
Senior Housing Facilities | Enlivant Joint Venture      
Real Estate [Line Items]      
Number of real estate properties sold | property 12    
Aggregate gross proceeds from the sale of real estate $ 18,200    
Number of properties | property 158