Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Total Stockholders' Equity [Roll Forward]
Beginning balance	$ 427,079	$ 374,571
Net current period other comprehensive items	(12,945)	(681)
Ending balance	424,272	381,996
Foreign Currency Translation Adjustment
Total Stockholders' Equity [Roll Forward]
Beginning balance	(36,145)
Other comprehensive (loss) income before reclassifications	(12,563)
Reclassifications from AOCI	0
Net current period other comprehensive items	(12,563)
Ending balance	(48,708)
Pension and Other Post-Retirement Benefit Liability Adjustments
Total Stockholders' Equity [Roll Forward]
Beginning balance	(831)
Other comprehensive (loss) income before reclassifications	38
Reclassifications from AOCI	(107)
Net current period other comprehensive items	(69)
Ending balance	(900)
Deferred Loss on Cash Flow Hedges
Total Stockholders' Equity [Roll Forward]
Beginning balance	(644)
Other comprehensive (loss) income before reclassifications	(345)
Reclassifications from AOCI	43
Net current period other comprehensive items	(302)
Ending balance	(946)
Accumulated Other Comprehensive Items
Total Stockholders' Equity [Roll Forward]
Beginning balance	(37,620)	(39,376)
Other comprehensive (loss) income before reclassifications	(12,870)
Reclassifications from AOCI	(64)
Net current period other comprehensive items	(12,934)	(648)
Ending balance	$ (50,554)	$ (40,024)