Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net Sales	$ 137,483	$ 113,822
Cost of sales	94,536	88,392
Gross profit	42,947	25,430
Selling, general and administrative expenses	15,214	13,677
(Gain) loss on disposition of assets	(62)	284
Income from operations	27,795	11,469
Interest income, net	61	9
Other (expense) income, net	(27)	(26)
Income before taxes	27,829	11,452
Income tax provision	5,976	2,695
Net income	$ 21,853	$ 8,757
Earnings per share:
Basic (usd per share)	$ 0.42	$ 0.17
Diluted (usd per share)	$ 0.41	$ 0.17
Weighted average shares outstanding:
Basic (in shares)	52,071,839	51,992,150
Diluted (in shares)	52,871,419	52,369,660