Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 144,806	$ 131,676
Cost of sales	79,637	74,049
Gross profit	65,169	57,627
Selling, general and administrative expenses	23,269	20,612
Income from operations	41,900	37,015
Interest expense, net	204	572
Income before income taxes	41,696	36,443
Provision for income taxes	13,747	12,737
Net income	$ 27,949	$ 23,706
Basic earnings per common share	$ 0.95	$ 0.80
Basic weighted average common shares outstanding	29,363,210	29,697,722
Diluted earnings per common share	$ 0.95	$ 0.79
Diluted weighted average common shares outstanding	29,561,406	29,910,292
Comprehensive income	$ 27,949	$ 23,706