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Market Risks and Derivative Contracts (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]          
Forward purchase contracts $ 92   $ 92   $ 57
Net gains associated with foreign currency derivative program 0 $ 100 (400) $ 200  
Forward Sale Contract, Mexican Pesos [Member]          
Derivative [Line Items]          
U.S. Dollar notional amount $ 5,088   $ 5,088    
Traded exchange rate 17.93   17.93    
Value date     Oct. 18, 2017    
Current Assets [Member]          
Derivatives, Fair Value [Line Items]          
Forward purchase contracts $ 92   $ 92   57
Current Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Forward sale contracts $ 0   $ 0   $ 0