CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Net sales:
Net sales of tangible products	$ 261,892	$ 225,121
Revenue from services and software	26,376	11,816
Total net sales	288,268	236,937
Cost of sales:
Cost of sales of tangible products	130,449	117,111
Cost of services and software	9,881	6,761
Total cost of sales	140,330	123,872
Gross profit	147,938	113,065
Operating expenses:
Selling and marketing	35,416	33,515
Research and development	22,857	21,858
General and administrative	28,391	25,277
Amortization of intangible assets	2,672	1,863
Acquisition costs	4,927	482
Exit and restructuring costs	267	1,895
Total operating expenses	94,530	84,890
Operating income	53,408	28,175
Other income (expense):
Investment income	421	677
Foreign exchange loss	(292)	(98)
Other, net	8	10
Total other income	137	589
Income before income taxes	53,545	28,764
Income taxes	11,939	5,222
Net income	$ 41,606	$ 23,542
Basic earnings per share	$ 0.83	$ 0.46
Diluted earnings per share	$ 0.82	$ 0.46
Basic weighted average shares outstanding	50,402	50,980
Diluted weighted average and equivalent shares outstanding	50,974	51,366