Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (5,403)	$ (5,034)
Unrealized gains (losses)	(1,971)	509
Amounts reclassified from accumulated other comprehensive income (loss)	38	60
Tax effect	(10)	(16)
Net of tax amount	(1,943)	553
Ending balance	(7,346)	(4,481)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(4,633)	(5,819)
Unrealized gains (losses)	(1,971)	509
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Tax effect	0	0
Net of tax amount	(1,971)	509
Ending balance	(6,604)	(5,310)
Defined benefit pension plans [member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(770)	785
Unrealized gains (losses)	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	38	60
Tax effect	(10)	(16)
Net of tax amount	28	44
Ending balance	$ (742)	$ 829