Consolidated Statements of Net Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Net sales	$ 757,853	$ 667,913	$ 664,955
Cost of sales	461,621	409,446	408,261
Gross profit	296,232	258,467	256,694
Selling, general and administrative expenses	132,657	124,277	116,740
Research and development expenses	24,415	21,231	19,439
Amortization of intangibles	9,279	6,089	6,611
Total operating expenses	166,351	151,597	142,790
Operating income	129,881	106,870	113,904
Interest expense	2,917	1,701	1,691
Impairment and equity in net loss of unconsolidated affiliate	10,678	7,334		[1]
Foreign exchange (gain) loss	(3,303)	3,179	1,238
Other expense (income), net	(4,646)	(5,396)	(4,126)
Income before income taxes	124,235	100,052	115,101
Income taxes	35,451	24,720	28,077
Net income	$ 88,784	$ 75,332	$ 87,024
Income per share:
Basic (in Dollars per share)	$ 3.98	$ 3.45	$ 3.96
Diluted (in Dollars per share)	$ 3.94	$ 3.40	$ 3.90
Weighted-average shares and equivalent shares outstanding:
Basic (in Shares)	22,315	21,822	21,901
Diluted (in Shares)	22,537	22,098	22,255

[1] During the first quarter of 2013, the company recorded approximately $10.7 million related to the impairment of Shocking Technologies. During the fourth quarter of 2012, the company recorded approximately $7.3 million related to the impairment and equity in net loss of its investment in Shocking Technologies (See Note 6).