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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)