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Debt and Financing Arrangements (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2019
Oct. 15, 2018
Debt Instrument [Line Items]        
Interest expense $ 300,000 $ 800,000    
Revolving Facility        
Debt Instrument [Line Items]        
Principal amount       $ 150,000,000
Long-term debt     $ 0  
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