Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 94,023	$ 95,502	$ 351,602	$ 317,458
Cost of sales	71,880	65,133	228,688	203,897
Gross profit	22,143	30,369	122,914	113,561
Selling, general and administrative expenses	15,698	15,902	58,763	54,468
Income from operations	6,445	14,467	64,151	59,093
Interest expense, net	157	167	482	791
Income before income taxes	6,288	14,300	63,669	58,302
Provision for income taxes	2,544	5,387	23,657	21,934
Net income	$ 3,744	$ 8,913	$ 40,012	$ 36,368
Basic earnings per common share	$ 0.12	$ 0.28	$ 1.27	$ 1.12
Basic weighted average common shares outstanding	31,227,643	31,606,264	31,547,212	32,538,832
Diluted earnings per common share	$ 0.12	$ 0.28	$ 1.25	$ 1.10
Diluted weighted average common shares outstanding	31,537,010	32,008,781	31,923,255	32,966,317
Comprehensive income	$ 3,744	$ 8,913	$ 40,012	$ 36,368