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Subsequent Events (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Oct. 11, 2016
$ / shares
Sep. 13, 2016
USD ($)
a
ft²
Aug. 31, 2016
Sep. 01, 2016
USD ($)
Subsequent Events [Line Items]        
Dividend payable, declared date     Oct. 11, 2016  
Dividends payable, date to be paid     Oct. 31, 2016  
Dividend payable, record date     Oct. 21, 2016  
Subsequent Events [Member]        
Subsequent Events [Line Items]        
Cash dividend declared | $ / shares $ 0.42      
Revolving credit facility, amount   $ 175.0    
Purchase price of property   10.7    
Expected capital costs   $ 4.5    
Subsequent Events [Member] | Land and Building [Member]        
Subsequent Events [Line Items]        
Area of property | a   2.23    
Subsequent Events [Member] | Office Space [Member]        
Subsequent Events [Line Items]        
Area of property | ft²   41,500    
Fourth Amended Credit Facility [Member] | Subsequent Events [Member] | Headquarters Office [Member]        
Subsequent Events [Line Items]        
Revolving credit facility, amount       $ 18.0