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Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net sales	$ 172,113	$ 162,366	$ 512,550	$ 472,713
Cost of sales	96,390	86,919	284,276	256,819
Gross profit	75,723	75,447	228,274	215,894
Operating expenses:
Research and development and other engineering	8,916	6,804	27,156	19,743
Selling	20,941	18,633	61,255	55,527
General and administrative	23,843	25,174	77,174	72,250
Loss (gain) on sale of assets	33	(46)	42	1
Total operating expenses	53,733	50,565	165,627	147,521
Income from operations	21,990	24,882	62,647	68,373
Gain in equity method investment, before tax		4,471		4,389
Interest income, net	55	79	177	258
Income before taxes	22,045	29,432	62,824	73,020
Provision for income taxes	9,069	10,052	26,788	27,069
Net income	$ 12,976	$ 19,380	$ 36,036	$ 45,951
Earnings per common share:
Basic (in dollars per share)	$ 0.27	$ 0.40	$ 0.75	$ 0.93
Diluted (in dollars per share)	$ 0.27	$ 0.40	$ 0.74	$ 0.93
Number of shares outstanding
Basic (in shares)	48,346	48,253	48,322	49,247
Diluted (in shares)	48,390	48,288	48,385	49,296
Cash dividends declared per common share (in dollars per share)	$ 0.125	$ 0.125	$ 0.375	$ 0.375

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