Consolidated Statements of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Net sales:
Net sales of tangible products	$ 225,121	$ 232,476
Revenue from services and software	11,816	11,399
Total net sales	236,937	243,875
Cost of sales:
Cost of sales of tangible products	117,111	119,033
Cost of services and software	6,761	4,959
Total cost of sales	123,872	123,992
Gross profit	113,065	119,883
Operating expenses:
Selling and marketing	33,515	32,114
Research and development	21,858	20,416
General and administrative	25,276	24,320
Amortization of intangible assets	1,863	770
Acquisition costs	482	254
Exit and restructuring costs	1,895	0
Total operating expenses	84,889	77,874
Operating income	28,176	42,009
Other income (expense):
Investment income	677	592
Foreign exchange loss	(98)	(342)
Other, net	9	(364)
Total other income (expense)	588	(114)
Income before income taxes	28,764	41,895
Income taxes	5,222	11,731
Net income	$ 23,542	$ 30,164
Basic earnings per share	$ 0.46	$ 0.58
Diluted earnings per share	$ 0.46	$ 0.58
Basic weighted average shares outstanding	50,980	51,998
Diluted weighted average and equivalent shares outstanding	51,366	52,301