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Derivative and Hedging Activities gain losses in Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
Other Nonoperating Income (Expense) [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) recognized in income | $ (44) | $ (1,268) | $ (609) | $ (1,382)

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