Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 496,905	$ 427,079
Other comprehensive items	(4,609)	(12,945)
Ending balance	504,308	424,272
Accumulated Other Comprehensive Items
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(19,492)	(37,620)
Other comprehensive items before reclassifications	(4,641)
Reclassifications from AOCI	93
Other comprehensive items	(4,548)	(12,934)
Ending balance	(24,040)	$ (50,554)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(17,894)
Other comprehensive items before reclassifications	(4,689)
Reclassifications from AOCI	0
Other comprehensive items	(4,689)
Ending balance	(22,583)
Post-Retirement Benefit Liability Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(770)
Other comprehensive items before reclassifications	18
Reclassifications from AOCI	10
Other comprehensive items	28
Ending balance	(742)
Deferred Loss on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(828)
Other comprehensive items before reclassifications	30
Reclassifications from AOCI	83
Other comprehensive items	113
Ending balance	$ (715)