CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net sales
Net sales of tangible products	$ 948,227	$ 936,282	$ 849,530
Revenue from services and software	47,941	47,206	44,829
Total net sales	996,168	983,488	894,359
Cost of sales
Cost of sales of tangible products	479,633	469,834	450,630
Cost of services and software	24,891	26,885	22,954
Total cost of sales	504,524	496,719	473,584
Gross profit	491,644	486,769	420,775
Operating expenses:
Selling and marketing	129,906	127,797	112,365
Research and development	87,364	89,926	82,575
General and administrative	92,167	81,345	73,229
Amortization of intangible assets	4,673	3,320	3,211
Acquisition costs	3,109	304	0
Litigation settlement	0	0	(1,082)
Exit and restructuring costs	960	2,041	2,262
Asset impairment charge	9,114	0	0
Total operating expenses	327,293	304,733	272,560
Operating income	164,351	182,036	148,215
Other income (expense):
Investment income	2,485	1,944	2,678
Foreign exchange loss	(941)	(2,006)	(169)
Other, net	(1,721)	(2,255)	(1,117)
Total other income (expense)	(177)	(2,317)	1,392
Income from continuing operations before income taxes	164,174	179,719	149,607
Income taxes	42,277	49,376	44,993
Income from continuing operations	121,897	130,343	104,614
Income (loss) from discontinued operations, net of tax	1,007	44,300	(2,836)
Net income	$ 122,904	$ 174,643	$ 101,778
Basic earnings per share
Income from continuing operations	$ 2.36	$ 2.42	$ 1.83
Income (loss) from discontinued operations	$ 0.02	$ 0.82	$ (0.05)
Net Income	$ 2.38	$ 3.24	$ 1.78
Diluted earnings per share
Income from continuing operations	$ 2.35	$ 2.40	$ 1.82
Income (loss) from discontinued operations	$ 0.02	$ 0.82	$ (0.05)
Net Income	$ 2.37	$ 3.22	$ 1.77
Basic weighted average shares outstanding	51,566	53,854	57,143
Diluted weighted average and equivalent shares outstanding	51,843	54,191	57,428