Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Net sales	$ 177,544	$ 188,233	$ 342,614	$ 363,636
Cost of sales	99,974	105,487	197,916	204,646
Gross profit	77,570	82,746	144,698	158,990
Selling, general and administrative expenses	35,397	35,989	67,818	71,037
Engineering, research and development expenses	13,427	12,726	25,600	24,715
Amortization of intangible assets	2,359	2,420	4,646	4,870
Operating income	26,387	31,611	46,634	58,368
Other income, net	(910)	(641)	(2,258)	(805)
Income before income taxes and equity in net income of affiliates	27,297	32,252	48,892	59,173
Income tax expense	7,516	10,579	12,714	19,644
Equity in net income of affiliates	0	0	0	(3)
Net income	$ 19,781	$ 21,673	$ 36,178	$ 39,532
Basic net income per common share	$ 0.14	$ 0.16	$ 0.26	$ 0.29
Diluted net income per common share	$ 0.14	$ 0.16	$ 0.26	$ 0.29
Weighted shares outstanding:
Basic	139,255	137,303	139,140	136,953
Diluted	139,751	138,196	139,791	138,121