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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 ($)
ft²
property
director
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
ft²
property
director
Sep. 30, 2016
USD ($)
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  
Affiliated entities | Supervisory fee revenue          
Related Party Transaction [Line Items]          
Revenue from related parties   $ 300 $ 300 $ 900 $ 1,100
Affiliated entities | Property management fee revenue          
Related Party Transaction [Line Items]          
Revenue from related parties   $ 100 100 $ 200 300
Affiliated entities | 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   3,074  
Number of properties | property 1 1   1  
Notice period for lease cancellation 90 days        
Affiliated entities | 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   647  
Chairman emeritus | Leased space rental          
Related Party Transaction [Line Items]          
Percentage of lease space occupied by Chairman emeritus and employee (as a percent) 15.00%        
Revenue from related parties, net of payment for pro rata share of leased space   $ 100   $ 300