Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Net Sales	$ 383,059	$ 329,002	$ 750,258	$ 646,379
Cost of sales	200,681	178,699	391,883	356,480
Gross profit	182,378	150,303	358,375	289,899
Selling, general and administrative expenses	65,200	52,985	123,469	103,477
Engineering, research and development expenses	30,231	27,221	57,817	54,460
Amortization of intangible assets	12,014	11,007	23,683	21,952
Operating income	74,933	59,090	153,406	110,010
Interest expense	8,296	8,196	16,455	16,669
Interest income	(1,371)	(93)	(2,304)	(173)
Other expense (income), net	3,877	(46)	4,016	856
Income before income tax expense	64,131	51,033	135,239	92,658
Income tax expense	9,782	11,042	23,328	20,153
Net income	$ 54,349	$ 39,991	$ 111,911	$ 72,505
Basic net income per common share	$ 0.38	$ 0.28	$ 0.79	$ 0.51
Diluted net income per common share	$ 0.38	$ 0.28	$ 0.78	$ 0.51
Weighted shares outstanding:
Basic	141,701	141,696	141,641	141,599
Diluted	143,238	143,508	143,445	143,411