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Real Estate Properties - Acquisition Activities (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2017
USD ($)
ft²
building
property
Aug. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
ft²
building
property
Mar. 31, 2016
USD ($)
Real Estate Properties [Line Items]        
Purchase price     $ 12,641 $ 79,244
Manassas, VA        
Real Estate Properties [Line Items]        
Number of properties | property 1   1  
Number of buildings acquired | building 1   1  
Rentable square feet of properties (in square feet) | ft² 69,374   69,374  
Percentage of property leased     100.00%  
Purchase price $ 12,641   $ 12,641  
Capitalized acquisition costs     $ 21  
Land 1,562      
Buildings and Improvement 8,237      
Other assumed assets $ 2,842      
Transferable Development Rights | Washington D.C.        
Real Estate Properties [Line Items]        
Consideration transferred excluding acquisition costs   $ 2,030