Consolidated Statements of Net Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Net sales	$ 170,918	$ 160,578
Cost of sales	106,312	99,716
Gross profit	64,606	60,862
Selling, general and administrative expenses	29,202	28,409
Research and development expenses	5,715	5,161
Amortization of intangibles	1,572	1,468
	36,489	35,038
Operating income	28,117	25,824
Interest expense	376	423
Impairment and equity in net loss of unconsolidated affiliate	10,678	525
Other (income) expense, net	(909)	101
Income before income taxes	17,972	24,775
Income taxes	3,178	7,212
Net income	$ 14,794	$ 17,563
Net income per share (see note 9):
Basic (in Dollars per share)	$ 0.67	$ 0.81
Diluted (in Dollars per share)	$ 0.66	$ 0.80
Weighted average shares and equivalent shares outstanding:
Basic (in Shares)	22,095	21,608
Diluted (in Shares)	22,366	21,929
Cash dividends paid per common share (in Dollars per share)	$ 0.20	$ 0.18