Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Net sales	$ 172,688	$ 173,987	$ 509,119	$ 517,762
Cost of sales	104,052	105,516	310,059	314,594
Gross profit	68,636	68,471	199,060	203,168
Selling, general and administrative expenses	30,601	32,015	90,199	87,851
Research and development expenses	5,505	5,297	15,553	14,754
Amortization of intangibles	1,599	1,585	4,457	4,780
	37,705	38,897	110,209	107,385
Operating income	30,931	29,574	88,851	95,783
Interest expense	454	414	1,298	1,271
Other (income) expense, net	(516)	(1,897)	(1,172)	(1,934)
Income before income taxes	30,993	31,057	88,725	96,446
Income taxes	6,995	6,118	23,234	24,660
Net income	23,998	24,939	65,491	71,786
Net income per share:
Basic (in Dollars per share)	$ 1.09	$ 1.13	$ 3.00	$ 3.25
Diluted (in Dollars per share)	$ 1.08	$ 1.12	$ 2.96	$ 3.19
Weighted average shares and equivalent shares outstanding:
Basic (in Shares)	21,923	22,000	21,770	22,023
Diluted (in Shares)	22,162	22,287	22,055	22,407
Comprehensive income	$ 34,320	$ 7,301	$ 76,674	$ 69,133