Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
Net sales	$ 303,052	$ 280,709	$ 570,076	$ 544,082
Cost of sales	163,847	152,622	316,165	299,459
Gross profit	139,205	128,087	253,911	244,623
Selling, general and administrative expenses	53,597	50,270	101,553	101,160
Engineering, research and development expenses	28,146	26,542	54,048	52,342
Amortization of intangible assets	11,062	11,928	22,351	24,235
Operating income	46,400	39,347	75,959	66,886
Interest expense	9,092	9,752	18,310	19,593
Interest income	(41)	(37)	(110)	(250)
Other income, net	(1,054)	(1,109)	(1,729)	(2,842)
Income before income tax expense and equity in net loss of affiliates	38,403	30,741	59,488	50,385
Income tax expense	5,513	6,245	10,386	10,915
Equity in net loss of affiliates	0	48	0	150
Net income	$ 32,890	$ 24,448	$ 49,102	$ 39,320
Basic net income per common share	$ 0.23	$ 0.17	$ 0.35	$ 0.28
Diluted net income per common share	$ 0.23	$ 0.17	$ 0.35	$ 0.28
Weighted shares outstanding:
Basic	140,953	140,307	140,867	140,146
Diluted	141,723	140,993	141,547	140,866