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Financial Instruments - Additional Derivative Information (Details) - Foreign currency exchange contract [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 31, 2017
Not designated as hedging instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount $ 92,000   $ 141,200
Cash flow hedges [Member] | Designated as hedging instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount based on forecasted revenue 138,700   $ 0
Other Income, Net [Member] | Cash flow hedges [Member] | Designated as hedging instrument [Member]      
Derivative [Line Items]      
Gain (loss) recognized in income – ineffective portion $ 0 $ 21