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Summary of Significant Accounting Policies - Operations (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Impairment expense $ 0 $ 0  
Assets held for sale disposal period 1 year    
Real estate held for sale $ 0   $ 0
Building and Building Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 7 years    
Building and Building Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 55 years    
Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 2 years    
Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 15 years