Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Net sales	$ 345,591	$ 296,692	$ 991,970	$ 866,768
Cost of sales	190,184	173,712	546,664	489,877
Gross profit	155,407	122,980	445,306	376,891
Selling, general and administrative expenses	57,699	51,614	161,176	153,167
Engineering, research and development expenses	26,002	25,720	80,462	79,768
Amortization of intangible assets	11,051	10,974	33,003	33,325
Operating income	60,655	34,672	170,665	110,631
Interest expense	7,749	9,468	24,418	27,778
Interest income	(150)	(123)	(323)	(233)
Other expense (income), net	2,906	(565)	3,762	(2,294)
Income before income tax expense	50,150	25,892	142,808	85,380
Income tax expense	9,248	3,945	29,401	14,331
Net income	$ 40,902	$ 21,947	$ 113,407	$ 71,049
Basic net income per common share	$ 0.29	$ 0.16	$ 0.80	$ 0.50
Diluted net income per common share	$ 0.28	$ 0.15	$ 0.79	$ 0.50
Weighted shares outstanding:
Basic	141,684	141,324	141,627	141,019
Diluted	143,594	142,473	143,472	141,856