CONSOLIDATED STATEMENTS OF EARNINGS (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:
Net sales of tangible products	$ 239,909	$ 234,708	$ 465,030	$ 467,184
Revenue from services and software	13,251	12,369	25,067	23,768
Total net sales	253,160	247,077	490,097	490,952
Cost of sales:
Cost of sales of tangible products	125,664	119,980	242,775	239,013
Cost of services and software	6,589	6,720	13,350	11,679
Total cost of sales	132,253	126,700	256,125	250,692
Gross profit	120,907	120,377	233,972	240,260
Operating expenses:
Selling and marketing	33,830	32,158	67,345	64,272
Research and development	23,201	22,336	45,059	42,752
General and administrative	24,053	24,402	49,329	48,722
Amortization of intangible assets	1,863	770	3,726	1,540
Acquisition costs	618	1,252	1,100	1,506
Exit and restructuring costs	1,101	0	2,996	0
Total operating expenses	84,666	80,918	169,555	158,792
Operating income	36,241	39,459	64,417	81,468
Other income (expense):
Investment income	473	826	1,150	1,418
Foreign exchange loss	(462)	(80)	(560)	(422)
Other, net	1,464	(486)	1,473	(850)
Total other income	1,475	260	2,063	146
Income from continuing operations before income taxes	37,716	39,719	66,480	81,614
Income taxes	7,158	9,366	12,380	21,097
Income from continuing operations	30,558	30,353	54,100	60,517
Income from discontinued operations, net of tax	8	300	8	300
Net income	$ 30,566	$ 30,653	$ 54,108	$ 60,817
Basic earnings per share:
Income from continuing operations	$ 0.60	$ 0.58	$ 1.06	$ 1.16
Income from discontinued operations	$ 0.00	$ 0.01	$ 0.00	$ 0.01
Net income	$ 0.60	$ 0.59	$ 1.06	$ 1.17
Diluted earnings per share:
Income from continuing operations	$ 0.60	$ 0.58	$ 1.05	$ 1.16
Income from discontinued operations	$ 0.00	$ 0.01	$ 0.00	$ 0.01
Net income	$ 0.60	$ 0.59	$ 1.05	$ 1.17
Basic weighted average shares outstanding	50,900	51,771	50,929	51,881
Diluted weighted average and equivalent shares outstanding	51,283	52,030	51,310	52,156