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Debt and Credit Arrangements - Foreign Facilities (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Revolving Credit Facility    
Debt Instrument    
Weighted average interest rate (percent)   4.80%
Foreign facilities    
Debt Instrument    
Foreign facilities $ 0  
Foreign facilities | Revolving Credit Facility    
Debt Instrument    
Foreign facilities 0 $ 4,400,000
Maximum borrowing capacity 21,100,000  
Letters of credit outstanding $ 31,600,000 $ 12,600,000