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Derivatives and Hedging Foreign Currency Contracts (Tables)
3 Months Ended
Mar. 31, 2018
Derivative [Line Items]  
Schedule of Derivative Instruments [Table Text Block]
During 2016 and 2017 the Company entered into multiple foreign currency forward contracts. The table below summarizes the maturity dates and the fixed exchange rates of the contracts:
 
2016 FX Contracts
 
2017 FX Contracts
Maturity date range:
 
 
 
   Minimum
April 2016
 
October 2017
   Maximum
April 2017
 
April 2018
Fixed exchange rate range:
 
 
 
   Minimum
1.2536
 
1.3002
   Maximum
1.3458
 
1.3518