Condensed Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
NET SALES	$ 61,493	$ 63,919	$ 122,869	$ 127,177
COST OF GOODS SOLD	19,334	19,565	37,976	38,199
Gross profit	42,159	44,354	84,893	88,978
OPERATING EXPENSES:
Sales and marketing	21,464	22,885	43,314	46,598
General and administrative	5,776	5,667	11,623	11,452
Research and development	4,602	4,864	9,131	9,057
Depreciation and amortization	4,182	4,124	8,624	8,446
Total operating expenses	36,024	37,540	72,692	75,553
INCOME FROM OPERATIONS	6,135	6,814	12,201	13,425
OTHER INCOME (EXPENSE):
Interest income	2	5	4	8
Other income	37	26	65	50
Interest expense	(275)	(260)	(577)	(607)
Foreign Currency Gain (Loss)	(557)	(113)	(759)	200
Total other income (expense)	(793)	(342)	(1,267)	(349)
INCOME BEFORE INCOME TAXES	5,342	6,472	10,934	13,076
PROVISION FOR INCOME TAXES	1,681	2,312	3,161	4,718
NET INCOME	$ 3,661	$ 4,160	$ 7,773	$ 8,358
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.26	$ 0.30	$ 0.56	$ 0.61
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.26	$ 0.30	$ 0.55	$ 0.60