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Related Party Transactions - Other (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2016
ft²
property
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2016
director
Jul. 31, 2016
ft²
property
Related Party Transaction [Line Items]            
Area of real estate property (in sqft) | ft²   10,100,000        
Number of directors (in directors) | director         1  
Affiliated Entity [Member] | Leased space rental [Member]            
Related Party Transaction [Line Items]            
Revenue from related parties   $ 200,000 $ 200,000 $ 100,000    
Area of real estate property (in sqft) | ft²           3,074
Number of properties (property) | property           1
Affiliated Entity [Member] | Annualized rent revenue [Member]            
Related Party Transaction [Line Items]            
Revenue from related parties   5,700,000 $ 4,400,000      
Undivided Interest [Member]            
Related Party Transaction [Line Items]            
Area of real estate property (in sqft) | ft² 5,351         647
Chairman emeritus [Member] | Leased space rental [Member]            
Related Party Transaction [Line Items]            
Number of properties (property) | property 1          
Lease cancellation, period of notice 90 days          
Percentage of lease space occupied by Chairman emeritus and employee 15.00%          
Revenue from related parties, net of payment for pro rata share of leased space   100,000        
Chairman emeritus [Member] | Purchase of miscellaneous furniture and artwork [Member]            
Related Party Transaction [Line Items]            
Revenue from related parties   $ 23,300