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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
ft²
property
director
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
ft²
property
director
Sep. 30, 2017
USD ($)
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 $ 0.2 $ 0.3 $ 0.9 $ 0.9
Affiliated entities | Property management fee revenue        
Related Party Transaction [Line Items]        
Revenue from related parties 0.1 0.1 0.3 0.2
Affiliated entities | Leased space rental        
Related Party Transaction [Line Items]        
Revenue from related parties $ 0.1 $ 0.1 $ 0.3 $ 0.3
Number of properties | property 1   1  
Notice period for lease cancellation     90 days  
Affiliated entities | Annualized rent revenue        
Related Party Transaction [Line Items]        
Revenue from related parties     $ 4.1  
Undivided interest        
Related Party Transaction [Line Items]        
Area of real estate property (in square feet) | ft² 5,351   5,351  
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%