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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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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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