Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Net sales	$ 175,853	$ 176,615	$ 336,431	$ 343,775
Cost of sales	106,291	106,621	206,007	209,078
Gross profit	69,562	69,994	130,424	134,697
Selling, general and administrative expenses	31,189	28,441	59,598	55,836
Research and development expenses	4,887	4,662	10,048	9,457
Amortization of intangibles	1,390	1,600	2,858	3,195
	37,466	34,703	72,504	68,488
Operating income	32,096	35,291	57,920	66,209
Interest expense	421	521	844	857
Other (income) expense, net	(757)	(11)	(656)	(37)
Income before income taxes	32,432	34,781	57,732	65,389
Income taxes	8,828	9,512	16,239	18,542
Net income	23,604	25,269	41,493	46,847
Net income per share:
Basic (in Dollars per share)	$ 1.08	$ 1.13	$ 1.91	$ 2.12
Diluted (in Dollars per share)	$ 1.07	$ 1.11	$ 1.88	$ 2.08
Weighted average shares and equivalent shares outstanding:
Basic (in Shares)	21,778	22,191	21,693	22,034
Diluted (in Shares)	22,074	22,590	22,004	22,460
Comprehensive income	$ 15,323	$ 28,943	$ 42,354	$ 61,828