Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 479,616	$ 440,804	$ 391,660
Cost of sales	292,521	285,935	251,464
Gross profit	187,095	154,869	140,196
Selling, general and administrative expenses	83,140	77,463	72,370
Income from operations	103,955	77,406	67,826
Interest expense, net	1,125	619	878
Income before income taxes	102,830	76,787	66,948
Provision for income taxes	34,983	28,689	25,427
Net income	$ 67,847	$ 48,098	$ 41,521
Basic earnings per common share	$ 2.31	$ 1.53	$ 1.28
Basic weighted average common shares outstanding	29,394,559	31,350,542	32,319,649
Diluted earnings per common share	$ 2.29	$ 1.52	$ 1.27
Diluted weighted average common shares outstanding	29,612,669	31,682,509	32,751,074
Comprehensive income	$ 67,847	$ 48,098	$ 41,521