CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales
Net sales of tangible products	$ 984,532	$ 948,227	$ 936,282
Revenue from services and software	53,627	47,941	47,206
Total net sales	1,038,159	996,168	983,488
Cost of sales
Cost of sales of tangible products	507,513	479,633	469,834
Cost of services and software	27,036	24,891	26,885
Total cost of sales	534,549	504,524	496,719
Gross profit	503,610	491,644	486,769
Operating expenses:
Selling and marketing	138,020	129,906	127,797
Research and development	91,147	87,364	89,926
General and administrative	96,216	92,167	81,345
Amortization of intangible assets	7,383	4,673	3,320
Acquisition costs	4,690	3,109	304
Exit and restructuring costs	5,890	960	2,041
Asset impairment charge	0	9,114	0
Total operating expenses	343,346	327,293	304,733
Operating income	160,264	164,351	182,036
Other income (expense):
Investment income	2,366	2,485	1,944
Foreign exchange loss	(524)	(941)	(2,006)
Other, net	1,721	(1,721)	(2,255)
Total other income (expense)	3,563	(177)	(2,317)
Income from continuing operations before income taxes	163,827	164,174	179,719
Income taxes	29,602	42,277	49,376
Income from continuing operations	134,225	121,897	130,343
Income from discontinued operations, net of tax	133	1,007	44,300
Net income	$ 134,358	$ 122,904	$ 174,643
Basic earnings per share
Income from continuing operations	$ 2.65	$ 2.36	$ 2.42
Income from discontinued operations	$ 0.00	$ 0.02	$ 0.82
Net Income	$ 2.65	$ 2.38	$ 3.24
Diluted earnings per share
Income from continuing operations	$ 2.63	$ 2.35	$ 2.40
Income from discontinued operations	$ 0.00	$ 0.02	$ 0.82
Net Income	$ 2.63	$ 2.37	$ 3.22
Basic weighted average shares outstanding	50,693	51,566	53,854
Diluted weighted average and equivalent shares outstanding	51,063	51,843	54,191