Segment Information (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Operating income	$ 38,631	$ 36,862	$ 104,915	$ 77,265
Unallocated expenses, net	(26,641)	(28,145)	(93,004)	(80,623)
Income (loss) before income taxes	11,990	8,717	11,911	(3,358)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	53,543	53,554	165,638	138,777
Operating Segments [Member] \| Medical Segment [Member]
Segment Reporting Information [Line Items]
Operating income	50,168	54,979	155,761	138,151
Operating Segments [Member] \| Non-Medical Segment [Member]
Segment Reporting Information [Line Items]
Operating income	3,375	(1,425)	9,877	626
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Operating income	$ (14,912)	$ (16,692)	$ (60,723)	$ (61,512)

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- Definition

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

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+ References

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