Segment Information (Reconciliation of Revenue 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, Revenue Reconciling Item [Line Items]
Total sales	$ 363,308	$ 346,567	$ 1,071,440	$ 1,027,187
Operating Segments [Member] | Medical Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	348,179	337,697	1,029,222	996,826
Operating Segments [Member] | Medical Segment [Member] | Cardio And Vascular [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	138,982	129,347	396,321	365,271
Operating Segments [Member] | Medical Segment [Member] | Cardiac Neuromodulation [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	101,616	108,147	311,614	323,599
Operating Segments [Member] | Medical Segment [Member] | Advanced Surgical, Orthopedics, and Portable Medical [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	107,581	100,203	321,287	307,956
Operating Segments [Member] | Non-Medical Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	$ 15,129	$ 8,870	$ 42,218	$ 30,361