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Related Party Transactions - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2016
ft²
property
Sep. 30, 2017
USD ($)
ft²
director
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
ft²
director
Sep. 30, 2016
USD ($)
Jul. 31, 2016
ft²
property
Related Party Transaction [Line Items]            
Area of real estate property (in square feet) | ft²   10,100,000   10,100,000    
Number of directors | director   1   1    
Affliliated entity | Supervisory fee revenue            
Related Party Transaction [Line Items]            
Revenue from related parties   $ 300 $ 300 $ 900 $ 1,100  
Affliliated entity | Property management fee revenue            
Related Party Transaction [Line Items]            
Revenue from related parties   100 100 200 300  
Affliliated entity | Leased space rental            
Related Party Transaction [Line Items]            
Revenue from related parties     $ 70   200  
Area of real estate property (in square feet) | ft²           3,074
Number of properties | property 1         1
Lease cancellation, notice period 90 days          
Affliliated entity | Annualized rent revenue            
Related Party Transaction [Line Items]            
Revenue from related parties       5,800 $ 5,700  
Undivided Interest            
Related Party Transaction [Line Items]            
Area of real estate property (in square feet) | ft² 5,351         647
Chairman emeritus | Leased space rental            
Related Party Transaction [Line Items]            
Percentage of lease space occupied by Chairman emeritus and employee 15.00%          
Revenue from revenue parties, net of payment for pro rata share of leased space   $ 100   $ 300