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Real Estate Investments - Properties held-for-sale (Details)
Jul. 29, 2021
USD ($)
Jun. 30, 2021
USD ($)
property
item
Dec. 31, 2020
USD ($)
Real estate investments      
Accumulated depreciation   $ 355,745,000 $ 349,643,000
SNF | Properties held-for-sale | Washington      
Real estate investments      
Number of properties | property   1  
Gross Investment   $ 8,024,000  
Accumulated depreciation   $ 3,512,000  
Number of beds/units | item   123  
Subsequent Event | SNF | Washington      
Real estate investments      
Amount of real estate property sold $ 7,700,000    
Proceeds from sale of real estate 7,200,000    
Subsequent Event | SNF | Properties held-for-sale | Washington      
Real estate investments      
Amount of real estate property sold 7,700,000    
Proceeds from sale of real estate 7,200,000    
Gain on sale of real estate $ 2,600,000