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Real Estate Investments, Net - Sale of Real Estate (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 14, 2020
USD ($)
facility
Jul. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Real Estate [Line Items]              
Net proceeds from sales of real estate           $ 2,189,000 $ 218,000
Gain (loss) on sale of real estate       $ 0 $ 217,000 (56,000) $ 217,000
Mortgage loan receivable              
Real Estate [Line Items]              
Mortgage loan       0   $ 0  
Mortgage loan receivable | Cascade Capital Group, LLC              
Real Estate [Line Items]              
Mortgage loan $ 32,400,000            
Mortgage loan     $ 13,900,000        
Mortgage loan receivable interest rate (percent) 7.50%            
Proceeds from settlement of loan   $ 13,900,000 $ 18,900,000 $ 13,900,000      
Disposed of by sale | Metron Skilled Nursing Facilities              
Real Estate [Line Items]              
Number of properties sold | facility 6            
Contract purchase price $ 36,000,000.0            
Net proceeds from sales of real estate 3,500,000            
Gain (loss) on sale of real estate $ (100,000)