Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Acquired Properties (Details)

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Real Estate and Intangible Assets - Summary of Acquired Properties (Details)
$ in Thousands
 6 Months Ended
Jun. 22, 2017
USD ($)
ft²
May 26, 2016
USD ($)
ft²
Jun. 30, 2017
USD ($)
ft²
Jun. 30, 2016
USD ($)
Dec. 31, 2016
ft²
Jul. 25, 2014
ft²
Business Acquisition [Line Items]            
Square Footage (unaudited) | ft²           81,371
Purchase Price     $ 15,697 $ 17,000    
Series of Property Acquisitions            
Business Acquisition [Line Items]            
Square Footage (unaudited) | ft²     60,016   107,062  
Lease Term       6 years    
Purchase Price     $ 15,697 $ 17,000    
Acquisition Expenses     247 105    
Annualized GAAP Rent       1,393    
Debt Issued or Assumed     11,179 9,900    
Conshohocken, Pennsylvania            
Business Acquisition [Line Items]            
Square Footage (unaudited) | ft² 60,016          
Lease Term 8 years 6 months          
Purchase Price     15,700      
Annualized GAAP Rent $ 1,680          
Debt assumed     11,200      
Capital expenditure $ 200          
Stated interest rate (as percent) 1.80%          
Conshohocken, Pennsylvania | Interest rate swap            
Business Acquisition [Line Items]            
Interest rate swap $ 40   200      
Conshohocken, Pennsylvania | Interest rate swap | LIBOR            
Business Acquisition [Line Items]            
Basis spread 3.55%          
Salt Lake City, Utah            
Business Acquisition [Line Items]            
Square Footage (unaudited) | ft²   107,062        
Lease Term   6 years        
Purchase Price   $ 17,000        
Annualized GAAP Rent   1,400        
Debt Issued or Assumed   $ 9,900        
Asset acquisition            
Business Acquisition [Line Items]            
Purchase Price     $ 15,697 $ 0