Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Income Statements [Abstract]
Net sales	$ 121,746	$ 78,892	$ 227,458	$ 150,268
Cost of sales	86,802	51,467	164,935	100,779
Gross profit	34,944	27,425	62,523	49,489
Research and development expenses	3,157	2,488	6,414	5,257
Selling, general and administrative expenses	23,477	17,621	45,264	34,229
Operating income	8,310	7,316	10,845	10,003
Interest (expense) income, net	(69)	17	(154)	100
Other (expense) income, net	(384)	(21)	(418)	22
Income before provision for income taxes	7,857	7,312	10,273	10,125
Provision for income taxes	(1,736)	(2,535)	(2,325)	(3,512)
Net income	$ 6,121	$ 4,777	$ 7,948	$ 6,613
Earnings per share:
Basic	$ 0.41	$ 0.35	$ 0.53	$ 0.48
Diluted	$ 0.40	$ 0.34	$ 0.52	$ 0.47
Shares used in computing earnings per share:
Basic	15,025	13,601	15,000	13,650
Diluted	15,407	13,929	15,395	14,011