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Segment Information (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
Segment Reporting Information [Line Items]
Operating income	$ 34,608	$ 44,076
Unallocated expenses, net	(9,630)	(7,437)
Income before taxes	24,978	36,639
Operating Segments
Segment Reporting Information [Line Items]
Operating income	55,527	66,429
Operating Segments | Medical
Segment Reporting Information [Line Items]
Operating income	55,525	65,216
Operating Segments | Non-Medical
Segment Reporting Information [Line Items]
Operating income	2	1,213
Segment Reconciling Items
Segment Reporting Information [Line Items]
Operating income	$ (20,919)	$ (22,353)

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