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Additional Financial Statement Information (Schedule of Other Items in Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 28, 2020 | Mar. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Foreign exchange gain (loss) | $ 900 | $ (736)
Interest income | 67 | 155
Pension expense | (159) | (158)
Other | (125) | (33)
Other nonoperating income (expense) | $ 683 | $ (772)

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