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Financial Instruments (Details 5) - Fair Value, Measurements, Recurring - Level 2 - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets - Foreign currency forward exchange contracts $ 5,244 $ 4,932
Liabilities - Foreign currency forward exchange contracts 7,123 3,538
Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets - Cross-currency interest rate swaps 634  
Interest Rate Derivative Liabilities, at Fair Value 1,368  
Cross currency interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets - Cross-currency interest rate swaps $ 0 $ 514