Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Net Sales	$ 398,597	$ 345,591	$ 1,148,855	$ 991,970
Cost of sales	216,881	190,184	608,764	546,664
Gross profit	181,716	155,407	540,091	445,306
Selling, general and administrative expenses	62,358	57,699	185,827	161,176
Engineering, research and development expenses	29,964	26,002	87,781	80,462
Amortization of intangible assets	21,419	11,051	45,102	33,003
Operating income	67,975	60,655	221,381	170,665
Interest expense	7,987	7,749	24,442	24,418
Interest income	(309)	(150)	(2,613)	(323)
Other expense, net	810	2,906	4,826	3,762
Income before income tax expense	59,487	50,150	194,726	142,808
Income tax expense	11,427	9,248	34,755	29,401
Net income	$ 48,060	$ 40,902	$ 159,971	$ 113,407
Basic net income per common share	$ 0.34	$ 0.29	$ 1.13	$ 0.80
Diluted net income per common share	0.34	0.28	1.12	0.79
Cash dividends declared per common share	$ 0.07	$ 0.07	$ 0.21	$ 0.00
Weighted shares outstanding:
Basic	141,556	141,684	141,613	141,627
Diluted	143,033	143,594	143,308	143,472