Segment Information (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Segment Reporting Information [Line Items]
Operating income	$ 39,739	$ 29,269	$ 66,284	$ 40,403
Unallocated expenses, net	(35,623)	(28,582)	(66,363)	(52,478)
Income (loss) before provision for income taxes	4,116	687	(79)	(12,075)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	60,173	44,931	112,095	75,761
Operating Segments [Member] \| Medical Segment [Member]
Segment Reporting Information [Line Items]
Operating income	55,233	41,869	105,593	73,710
Operating Segments [Member] \| Non-Medical Segment [Member]
Segment Reporting Information [Line Items]
Operating income	4,940	3,062	6,502	2,051
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Operating income	$ (20,434)	$ (15,662)	$ (45,811)	$ (35,358)

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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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