Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Operations [Abstract]
Net sales	$ 92,135	$ 84,714
Cost of sales	27,390	25,009
Gross profit	64,745	59,705
Selling, general and administrative expenses	51,212	47,949
Income from operations	13,533	11,756
Interest expense	(485)	(570)
Other income	36	31
Income before income taxes	13,084	11,217
Provision for income taxes	(5,075)	(4,459)
Net income	$ 8,009	$ 6,758
Income per common share:
Basic	$ 0.16	$ 0.13
Diluted	$ 0.15	$ 0.13
Weighted average shares outstanding:
Basic	51,523,627	51,359,167
Diluted	52,140,945	51,666,432