Consolidated Statements of Net Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 28, 2014		Jun. 29, 2013		Jun. 28, 2014		Jun. 29, 2013
Net sales	$ 220,908	[1]	$ 187,766	[1]	$ 427,767		$ 358,684
Cost of sales	137,913		114,209		266,278		220,521
Gross profit	82,995		73,557		161,489		138,163
Selling, general and administrative expenses	38,328		34,452		72,499		63,654
Research and development expenses	7,810		5,793		15,384		11,508
Amortization of intangibles	3,138		1,930		6,297		3,502
	49,276		42,175		94,180		78,664
Operating income	33,719		31,382		67,309		59,499
Interest expense	1,228		644		2,444		1,020
Impairment and equity in net loss of unconsolidated affiliate		[2]		[2]		[2]	10,678	[2]
Foreign exchange loss (gain)	2,375		(3,724)		2,123		(3,405)
Other (income) expense, net	(1,446)		(935)		(2,632)		(2,163)
Income before income taxes	31,562		35,397		65,374		53,369
Income taxes	6,984		8,749		15,407		15,233
Net income	$ 24,578		$ 26,648		$ 49,967		$ 38,136
Net income per share (see Note 8):
Basic (in Dollars per share)	$ 1.09		$ 1.19		$ 2.21		$ 1.72
Diluted (in Dollars per share)	$ 1.08		$ 1.18		$ 2.20		$ 1.70
Weighted average shares and equivalent shares outstanding:
Basic (in Shares)	22,579		22,296		22,536		22,197
Diluted (in Shares)	22,750		22,499		22,738		22,431
Cash dividends paid per common share (in Dollars per share)	$ 0.22		$ 0.20		$ 0.44		$ 0.40

[1] Sales by country represent sales to customer or distributor locations.

[2] During the first quarter of 2013, the company recorded an impairment of its investment in Shocking Technologies. (See Note 5).