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Line of Credit - Credit Agreement - General Information (Details) - Credit Agreement - Line of Credit - USD ($)
$ in Millions
May 26, 2016
Sep. 30, 2017
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Debt instrument, term (in years) 5 years  
Line of credit, maximum borrowing capacity $ 75.0  
Outstanding line of credit   $ 0.0
Letter of Credit    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity 25.0  
Swing Loan    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity $ 7.5