Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Net sales	$ 164,585	$ 184,449	$ 507,199	$ 548,085
Cost of sales	94,453	102,517	292,369	307,163
Gross profit	70,132	81,932	214,830	240,922
Selling, general and administrative expenses	31,746	39,095	99,564	110,132
Engineering, research and development expenses	13,947	13,314	39,547	38,029
Amortization of intangible assets	2,343	2,389	6,989	7,259
Contingent consideration fair value adjustment	(1,813)	0	(1,813)	0
Operating income	23,909	27,134	70,543	85,502
Other expense (income), net	963	1,441	(1,295)	636
Income before income taxes and equity in net income of affiliates	22,946	25,693	71,838	84,866
Income tax expense	5,139	7,656	17,853	27,300
Equity in net income of affiliates	0	0	0	(3)
Net income	$ 17,807	$ 18,037	$ 53,985	$ 57,569
Basic net income per common share	$ 0.13	$ 0.13	$ 0.39	$ 0.42
Diluted net income per common share	$ 0.13	$ 0.13	$ 0.39	$ 0.42
Weighted shares outstanding:
Basic	138,904	137,453	139,061	137,119
Diluted	139,482	138,499	139,688	138,247