CONSOLIDATED STATEMENTS OF OPERATIONS (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
NET SALES	$ 91,249	$ 74,948	$ 177,880	$ 142,380
COST OF SALES	48,765	42,490	95,611	81,487
GROSS PROFIT	42,484	32,458	82,269	60,893
OPERATING EXPENSES:
Selling, general, and administrative	26,175	19,939	50,766	38,971
Research and development	5,462	3,742	10,446	6,799
Total operating expenses	31,637	23,681	61,212	45,770
INCOME FROM OPERATIONS	10,847	8,777	21,057	15,123
OTHER INCOME (EXPENSE):
Interest income	14	12	16	20
Interest expense	(311)	(15)	(736)	(50)
Other income - net	68	65	79	76
Other income (expense) - net	(229)	62	(641)	46
INCOME BEFORE INCOME TAXES	10,618	8,839	20,416	15,169
INCOME TAX EXPENSE	3,746	3,124	6,905	4,946
NET INCOME	$ 6,872	$ 5,715	$ 13,511	$ 10,223
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.19	$ 0.16	$ 0.37	$ 0.29
Diluted (in dollars per share)	$ 0.18	$ 0.16	$ 0.37	$ 0.28
AVERAGE COMMON SHARES:
Basic (in shares)	36,804	35,243	36,199	35,230
Diluted (in shares)	37,677	35,911	36,966	35,925