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Debt Revolving Credit Agreement (Details) - USD ($)
1 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2018
Jun. 30, 2016
Line of Credit Facility [Line Items]      
Proceeds from lines of credit $ 75,000,000    
Debt instrument, term 6 months    
Line of credit, current   $ 0  
Line of credit facility, remaining borrowing capacity   195,600,000  
Line of Credit      
Line of Credit Facility [Line Items]      
Long-term line of credit     $ 200,000,000
Debt issuance costs, line of credit arrangements, gross     700,000
Line of Credit | Letter of Credit      
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity     10,000,000
Line of credit facility, remaining borrowing capacity   $ 5,600,000  
Foreign Currency Line of Credit | Letter of Credit      
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 25,000,000
Minimum | Line of Credit      
Line of Credit Facility [Line Items]      
Debt instrument, interest rate, stated percentage     0.75%
Line of credit facility, unused capacity, commitment fee percentage   0.25%  
Maximum | Line of Credit      
Line of Credit Facility [Line Items]      
Debt instrument, interest rate, stated percentage     2.75%
Line of credit facility, unused capacity, commitment fee percentage   0.45%