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Financing Arrangements (Borrowings Under Existing Financing Arrangements) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term notes $ 42,631 $ 45,378
Less: current portion (3,654) (3,604)
Total long-term debt 42,631 45,378
Long-term notes    
Debt Instrument [Line Items]    
Long-term notes $ 46,285 $ 48,982