Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
NET SALES	$ 63,258	$ 59,301
COST OF GOODS SOLD	18,634	18,590
Gross profit	44,624	40,711
OPERATING EXPENSES:
Sales and marketing	23,713	21,524
General and administrative	5,785	5,096
Research and development	4,193	3,850
Depreciation and amortization	4,322	4,175
Total operating expenses	38,013	34,645
INCOME FROM OPERATIONS	6,611	6,066
OTHER INCOME (EXPENSE):
Interest income	3	1
Other income	24	29
Interest expense	(347)	(283)
Foreign Currency Transaction Gain (Loss), before Tax	313	(462)
Total other income (expense)	(7)	(715)
INCOME BEFORE INCOME TAXES	6,604	5,351
PROVISION FOR INCOME TAXES	2,406	1,494
NET INCOME	$ 4,198	$ 3,857
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.31	$ 0.29
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.30	$ 0.29