Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 311,596	$ 220,648	$ 557,120	$ 421,043
Cost of sales	193,323	128,243	343,046	238,941
Gross profit	118,273	92,405	214,074	182,102
Selling, general and administrative expenses	35,916	29,009	67,229	63,571
Income from operations	82,357	63,396	146,845	118,531
Interest expense (income), net	13	(71)	10	(593)
Income before income taxes	82,344	63,467	146,835	119,124
Provision for income taxes	20,978	16,249	36,925	29,504
Net income	$ 61,366	$ 47,218	$ 109,910	$ 89,620
Basic earnings per common share	$ 0.53	$ 0.41	$ 0.95	$ 0.77
Basic weighted average common shares outstanding	115,362,757	115,733,934	115,512,231	115,996,494
Diluted earnings per common share	$ 0.53	$ 0.41	$ 0.95	$ 0.77
Diluted weighted average common shares outstanding	115,662,626	116,061,988	115,839,183	116,354,714
Comprehensive income	$ 61,366	$ 47,218	$ 109,910	$ 89,620