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Debt and Financing Arrangements (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Oct. 15, 2018
Debt Instrument [Line Items]        
Principal repayments of debt   $ 50,000,000 $ 0  
interest rate   1.03%    
Interest expense $ 200,000 $ 600,000    
Increase in borrowing rate   1.00%    
Interest expense annual increase   $ 100,000    
Revolving Facility        
Debt Instrument [Line Items]        
Principal amount       $ 150,000,000
Principal repayments of debt 50,000,000      
Long-term debt $ 25,000,000 $ 25,000,000    
Credit Agreement        
Debt Instrument [Line Items]        
Additional borrowings available       100,000,000
Swing Loans        
Debt Instrument [Line Items]        
Additional borrowings available       20,000,000
Letter of Credit        
Debt Instrument [Line Items]        
Additional borrowings available       $ 20,000,000