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Derivatives (Details 1)
€ in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Derivatives not designated as hedging instruments | Foreign currency forward contracts        
Derivatives, Fair Value [Line Items]        
Notional Amount     $ 67,672 $ 42,866
Fair Value Asset Derivatives [1]     539 12
Fair Value Liability Derivatives [1]     2,010 162
Derivatives not designated as hedging instruments | Foreign currency option contracts        
Derivatives, Fair Value [Line Items]        
Notional Amount € 180,000     0
Fair Value Asset Derivatives     0 0
Fair Value Liability Derivatives     0 0
Derivatives designated as hedging instruments        
Derivatives, Fair Value [Line Items]        
Derivative, Term of Contract 1 year 1 year    
Cash Flow Hedge Gains to be Reclassified within Twelve Months   $ 2,004    
Derivatives designated as hedging instruments | Foreign currency forward contracts        
Derivatives, Fair Value [Line Items]        
Notional Amount     3,033 2,127
Fair Value Asset Derivatives [1]     8,346 0
Fair Value Liability Derivatives [1]     31,921 13
Derivatives designated as hedging instruments | Foreign currency option contracts        
Derivatives, Fair Value [Line Items]        
Notional Amount     8,870 8,522
Fair Value Asset Derivatives [1]     67 184
Fair Value Liability Derivatives [1]     $ 0 0
Derivatives designated as hedging instruments | Cross currency swap contracts        
Derivatives, Fair Value [Line Items]        
Notional Amount € 183,000     $ 0
Aggregate interest paid over the course of the loan | € 33,000      
Debt Instrument, Face Amount | € € 150,000      
Derivative, Maturity Date Apr. 04, 2022 Apr. 04, 2022    
[1] Contracts that mature within the next 12 months are included in Other Current Assets and Other Current Liabilities for asset derivatives and liability derivatives, respectively, on our Condensed Consolidated Balance Sheets. Contracts with maturities greater than 12 months are included in Other Assets and Other Liabilities for asset derivatives and liability derivatives, respectively, on our Condensed Consolidated Balance Sheets. Amounts included in our Condensed Consolidated Balance Sheets are recorded net where a right of offset exists with the same derivative counterparty.