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Summary of Significant Accounting Policies - Owned Properties (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Owned Properties    
Number of beds damaged | item 114 170
Gain from property insurance proceeds | $ $ 373,000 $ 2,111,000
Computer Equipment | Minimum    
Owned Properties    
Useful life 3 years  
Computer Equipment | Maximum    
Owned Properties    
Useful life 5 years  
Furniture and Fixtures | Minimum    
Owned Properties    
Useful life 5 years  
Furniture and Fixtures | Maximum    
Owned Properties    
Useful life 15 years  
Building | Minimum    
Owned Properties    
Useful life 35 years  
Building | Maximum    
Owned Properties    
Useful life 50 years  
Site Improvements | Minimum    
Owned Properties    
Useful life 10 years  
Site Improvements | Maximum    
Owned Properties    
Useful life 20 years  
Building Improvements | Minimum    
Owned Properties    
Useful life 10 years  
Building Improvements | Maximum    
Owned Properties    
Useful life 50 years