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Nature of Business and Financial Statement Presentation (Useful Lives) (Details)
12 Months Ended
Dec. 31, 2020
Building and building and land improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life 20 years
Building and building and land improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life 40 years
Furniture, fixtures, and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life 5 years
Furniture, fixtures, and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life 10 years
Tenant improvements  
Property, Plant and Equipment [Line Items]  
Estimated useful lives The shorter of the term of the related lease or useful life