Other Expense (Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Other Income and Expenses [Abstract]
Foreign currency losses (gains)	$ 4,316	$ (5,374)	$ 8,390	$ (5,195)
Governmental pandemic assistance reimbursement	(1,493)	0	(7,374)	0
Insurance reimbursement	(1,257)	0	(1,257)	0
Pension expense	344	2,726	975	8,126
(Gain) loss on sale of business units, property, and equipment	(287)	240	(2,697)	(1,551)
Other items	(244)	(279)	(1,487)	(1,421)
Legal settlement income	0	0	0	(1,247)
Total other expense (income)	$ 1,379	$ (2,687)	$ (3,450)	$ (1,288)