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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (7,346) $ (4,481) $ (5,403) $ (5,034)
Unrealized gains (losses) 732 698 (1,239) 1,207
Amounts reclassified from accumulated other comprehensive income (loss) 38 (1,655) 76 (1,595)
Tax effect (10) 169 (20) 153
Net of tax amount 760 (788) (1,183) (235)
Ending balance (6,586) (5,269) (6,586) (5,269)
Foreign currency translation adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (6,604) (5,310) (4,633) (5,819)
Unrealized gains (losses) 732 698 (1,239) 1,207
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Tax effect 0 0 0 0
Net of tax amount 732 698 (1,239) 1,207
Ending balance (5,872) (4,612) (5,872) (4,612)
Defined benefit pension plans [member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (742) 829 (770) 785
Unrealized gains (losses) 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 38 (1,655) 76 (1,595)
Tax effect (10) 169 (20) 153
Net of tax amount 28 (1,486) 56 (1,442)
Ending balance $ (714) $ (657) $ (714) $ (657)