Segment Information (Reconciliation of Revenue 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, Revenue Reconciling Item [Line Items]
Total sales	$ 362,719	$ 348,382	$ 708,132	$ 680,620
Operating Segments [Member] | Medical Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	346,976	338,563	681,043	659,129
Operating Segments [Member] | Medical Segment [Member] | Cardio And Vascular [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	132,231	122,253	257,339	235,924
Operating Segments [Member] | Medical Segment [Member] | Cardiac Neuromodulation [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	106,185	106,919	209,998	215,452
Operating Segments [Member] | Medical Segment [Member] | Advanced Surgical, Orthopedics, and Portable Medical [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	108,560	109,391	213,706	207,753
Operating Segments [Member] | Non-Medical Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	$ 15,743	$ 9,819	$ 27,089	$ 21,491