Condensed Consolidated Statements of Comprehensive 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	$ 136,779	$ 121,311	$ 257,579	$ 221,956
Cost of sales	84,255	76,285	156,808	138,764
Gross profit	52,524	45,026	100,771	83,192
Selling, general and administrative expenses	22,472	20,344	43,064	38,566
Income from operations	30,052	24,682	57,707	44,626
Interest expense, net	188	301	325	623
Income before income taxes	29,864	24,381	57,382	44,003
Provision for income taxes	11,149	9,220	21,114	16,547
Net income	$ 18,715	$ 15,161	$ 36,268	$ 27,456
Basic earnings per common share	$ 0.59	$ 0.46	$ 1.14	$ 0.83
Basic weighted average common shares outstanding	31,735,333	32,898,288	31,709,645	33,012,845
Diluted earnings per common share	$ 0.58	$ 0.46	$ 1.13	$ 0.82
Diluted weighted average common shares outstanding	32,142,939	33,307,463	32,119,026	33,452,814
Comprehensive income	$ 18,715	$ 15,161	$ 36,268	$ 27,456