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Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Operations and Comprehensive Income [Abstract]
Net sales	$ 90,756	$ 73,783	$ 262,848	$ 219,878
Cost of sales	51,131	43,219	147,499	130,722
Gross profit	39,625	30,564	115,349	89,156
Operating expenses	26,460	22,396	73,540	61,118
Operating income	13,165	8,168	41,809	28,038
Interest expense	701	899	2,157	2,684
Interest capitalized	(165)	(18)	(313)	(92)
Extinguishment of debt				546
Income before income tax	12,629	7,287	39,965	24,900
Income tax expense	4,553	2,669	14,411	9,263
Net income	8,076	4,618	25,554	15,637
Change in fair value of interest swaps	41	(601)	87	(1,547)
Foreign currency translation adjustment	306	(988)	428	(554)
Comprehensive income	$ 8,423	$ 3,029	$ 26,069	$ 13,536
Earnings per common share-basic	$ 0.29	$ 0.17	$ 0.92	$ 0.57
Earnings per common share-assuming dilution	$ 0.28	$ 0.16	$ 0.89	$ 0.56
Weighted average shares outstanding-basic	27,970	27,575	27,818	27,551
Weighted average shares outstanding-assuming dilution	28,878	27,993	28,673	27,842

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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