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Derivative and Hedging Activities gain losses in Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 25, 2020 | Sep. 27, 2019 | Sep. 25, 2020 | Sep. 27, 2019
Other Nonoperating Income (Expense) [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains (losses) recognized in operations | $ 618 | $ (1,357) | $ 285 | $ (1,966)

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