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Derivatives and Hedging Activities Assets Liabilities Balance Sheet Location (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands | Sep. 28, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | $ 5 | $ 33
Derivative Liability, Current | 195 | 4
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | 5 | 33
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Current | $ 195 | $ 4

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