Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
REVENUES:
Net sales	$ 73,113	$ 74,173
Other	117	126
TOTAL REVENUE	73,230	74,299
COST OF GOODS SOLD	37,203	37,505
Gross profit	36,027	36,794
OPERATING EXPENSES:
Selling, general and administrative	22,519	22,866
Research and development	3,631	1,903
Total operating expenses	26,150	24,769
Income from operations	9,877	12,025
OTHER INCOME(EXPENSE)	210	168
Income before income taxes	10,087	12,193
PROVISION FOR INCOME TAXES	(3,430)	(3,508)
NET INCOME	$ 6,657	$ 8,685
NET INCOME PER SHARE
Basic (in dollars per share)	$ 0.44	$ 0.60
Diluted (in dollars per share)	$ 0.43	$ 0.58
WEIGHTED AVERAGE NUMBER OF SHARES
Basic (in shares)	15,097	14,507
Diluted (in shares)	15,395	15,053