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Financing Arrangements (Long-Term Debt Outstanding, Revolving Credit and European Investment Bank Financing Agreement) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total long-term facilities $ 72,048 $ 87,802
Less current portion of long-term debt 21,635 25,844
Total long-term debt 50,413 61,958
Loans Payable | European Investment Bank    
Debt Instrument [Line Items]    
Total long-term facilities $ 58,213 69,893
Interest rate (percent) 0.95%  
Loans Payable | Mediocredito Italiano    
Debt Instrument [Line Items]    
Total long-term facilities $ 8,406 9,118
Loans Payable | Mediocredito Italiano | Minimum    
Debt Instrument [Line Items]    
Interest rate (percent) 0.50%  
Loans Payable | Mediocredito Italiano | Maximum    
Debt Instrument [Line Items]    
Interest rate (percent) 3.10%  
Loans Payable | Banca del Mezzogiorno    
Debt Instrument [Line Items]    
Total long-term facilities $ 4,137 5,499
Loans Payable | Banca del Mezzogiorno | Minimum    
Debt Instrument [Line Items]    
Interest rate (percent) 0.50%  
Loans Payable | Banca del Mezzogiorno | Maximum    
Debt Instrument [Line Items]    
Interest rate (percent) 3.15%  
Loans Payable | Novalia SA    
Debt Instrument [Line Items]    
Total long-term facilities $ 756 845
Loans Payable | Novalia SA | Minimum    
Debt Instrument [Line Items]    
Interest rate (percent) 0.00%  
Loans Payable | Novalia SA | Maximum    
Debt Instrument [Line Items]    
Interest rate (percent) 2.45%  
Loans Payable | Bpifrance    
Debt Instrument [Line Items]    
Total long-term facilities $ 0 1,450
Interest rate (percent) 2.58%  
Mortgages | Mediocredito Italiano    
Debt Instrument [Line Items]    
Total long-term facilities $ 536 $ 997
Mortgages | Mediocredito Italiano | Minimum    
Debt Instrument [Line Items]    
Interest rate (percent) 0.80%  
Mortgages | Mediocredito Italiano | Maximum    
Debt Instrument [Line Items]    
Interest rate (percent) 1.30%