Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 220,648	$ 206,453	$ 421,043	$ 386,024
Cost of sales	128,243	123,009	238,941	233,214
Gross profit	92,405	83,444	182,102	152,810
Selling, general and administrative expenses	29,009	35,705	63,571	65,872
Income from operations	63,396	47,739	118,531	86,938
Interest income, net	(71)	(1)	(593)	(57)
Income before income taxes	63,467	47,740	119,124	86,995
Provision for income taxes	16,249	12,030	29,504	19,730
Net income	$ 47,218	$ 35,710	$ 89,620	$ 67,265
Basic earnings per common share	$ 0.82	$ 0.61	$ 1.55	$ 1.15
Basic weighted average common shares outstanding	57,866,967	58,486,192	57,998,247	58,514,676
Diluted earnings per common share	$ 0.81	$ 0.61	$ 1.54	$ 1.14
Diluted weighted average common shares outstanding	58,030,994	58,687,540	58,177,357	58,758,201
Comprehensive income	$ 47,218	$ 35,710	$ 89,620	$ 67,265