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Financial Instruments and Fair Value Measurements (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - Forward Currency Contracts [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Notional amounts $ 920 [1] $ 1,486
Cash flow hedges , other derivative assets 4  
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Notional amounts 7,112 [1] 9,143
Cash flow hedges , other derivative assets 665 0
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of other derivatives 0 (48)
Other Liabilities [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Cash flow hedges , prepaid expense and other current assets $ 0 $ (221)
[1] Notional amounts represent the gross contract of the derivatives outstanding in U.S. dollars.