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Derivatives (Details 3)
€ in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Sep. 30, 2017
EUR (€)
Dec. 31, 2015
USD ($)
Derivatives not designated as hedging instruments | Foreign currency forward contracts          
Derivatives, Fair Value [Line Items]          
Notional Amount $ 67,672   $ 42,866   $ 45,851
Fair Value Asset Derivatives 539 [1]   12 [1]   171
Fair Value Liability Derivatives 2,010 [1]   162 [1]   7
Derivatives not designated as hedging instruments | Foreign currency option contracts          
Derivatives, Fair Value [Line Items]          
Notional Amount     0 € 180,000  
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 1 year    
Cash Flow Hedge Gains to be Reclassified within Twelve Months $ 2,004   $ 71    
Derivatives designated as hedging instruments | Foreign currency forward contracts          
Derivatives, Fair Value [Line Items]          
Notional Amount 3,033   2,127   2,486
Fair Value Asset Derivatives 8,346 [1]   0 [1]   113
Fair Value Liability Derivatives 31,921 [1]   13 [1]   0
Derivatives designated as hedging instruments | Foreign currency option contracts          
Derivatives, Fair Value [Line Items]          
Notional Amount 8,870   8,522   11,271
Fair Value Asset Derivatives 67 [1]   184 [1]   387
Fair Value Liability Derivatives $ 0 [1]   0 [1]   $ 0
Derivatives designated as hedging instruments | Cross currency swap contracts          
Derivatives, Fair Value [Line Items]          
Notional Amount     $ 0 183,000  
Aggregate interest paid over the course of the loan | €   € 33,000      
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.