Consolidated Statements of Net Income (unaudited) (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	$ 187,766		$ 175,853		$ 358,684		$ 336,431
Cost of sales	114,209		106,291		220,521		206,007
Gross profit	73,557		69,562		138,163		130,424
Selling, general and administrative expenses	34,452		31,189		63,654		59,598
Research and development expenses	5,793		4,887		11,508		10,048
Amortization of intangibles	1,930		1,390		3,502		2,858
	42,175		37,466		78,664		72,504
Operating income	31,382		32,096		59,499		57,920
Interest expense	644		421		1,020		844
Impairment and equity in net loss of unconsolidated affiliate			1,033		10,678		1,558
Other (income) expense, net	(4,659)		(757)		(5,568)		(656)
Income before income taxes	35,397	[1]	31,399	[1]	53,369	[1]	56,174	[1]
Income taxes	8,749		8,436		11,927		15,648
Net income	$ 26,648		$ 22,963		$ 41,442		$ 40,526
Net income per share (see Note 9):
Basic (in Dollars per share)	$ 1.19		$ 1.05		$ 1.87		$ 1.86
Diluted (in Dollars per share)	$ 1.18		$ 1.04		$ 1.85		$ 1.84
Weighted average shares and equivalent shares outstanding:
Basic (in Shares)	22,296		21,778		22,197		21,693
Diluted (in Shares)	22,499		22,074		22,431		22,004
Cash dividends paid per common share (in Dollars per share)	$ 0.20		$ 0.18		$ 0.40		$ 0.36

[1] 2012 Income before income taxes has been restated to reflect the company's retroactive equity losses from Shocking Technologies. (See Note 2).