Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 684,250	$ 565,153	$ 479,616
Cost of sales	389,356	321,780	292,521
Gross profit	294,894	243,373	187,095
Selling, general and administrative expenses	118,225	100,993	83,140
Income from operations	176,669	142,380	103,955
Interest (income) expense, net	(192)	461	1,125
Income before income taxes	176,861	141,919	102,830
Provision for income taxes	42,289	46,791	34,983
Net income	$ 134,572	$ 95,128	$ 67,847
Basic earnings per common share	$ 2.29	$ 1.62	$ 1.16
Basic weighted average common shares outstanding	58,739,670	58,785,118	58,789,118
Diluted earnings per common share	$ 2.28	$ 1.61	$ 1.15
Diluted weighted average common shares outstanding	59,067,302	59,150,920	59,225,338
Comprehensive income	$ 134,572	$ 95,128	$ 67,847