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Derivatives and Hedging Activities Notional Amounts (Details) - Foreign Exchange Forward [Member] - Not Designated as Hedging Instrument [Member] - Fair Value Hedging [Member] - USD ($) $ in Thousands | Sep. 28, 2018 | Dec. 31, 2017
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Long [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Purchase - Derivative Assets | $ 28,782 | $ 12,875
Short [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Sell - Derivative Liability | $ 0 | $ 1,509

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