Segment Information (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Segment Reporting Information [Line Items]
Operating income	$ 39,758	$ 46,481	$ 93,019	$ 134,987
Unallocated expenses, net	(8,358)	(10,982)	(24,815)	(39,524)
Income from continuing operations before taxes	31,400	35,499	68,204	95,463
Gain related to litigation settlement	28,200		28,200
Operating Segments
Segment Reporting Information [Line Items]
Operating income	29,991	65,966	125,797	195,661
Operating Segments \| Medical
Segment Reporting Information [Line Items]
Operating income	28,777	62,648	120,903	182,734
Operating Segments \| Non-Medical
Segment Reporting Information [Line Items]
Operating income	1,214	3,318	4,894	12,927
Segment Reconciling Items
Segment Reporting Information [Line Items]
Operating income	$ 9,767	$ (19,485)	$ (32,778)	$ (60,674)

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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