Net Sales (Tables)

12 Months Ended

Dec. 31, 2020

Revenue From Contract With Customer [Abstract]

Summary of Net Sales Disaggregated by Principal Markets

As discussed in Note 1, we primarily derive our revenues from the sales of various chemical products.  The following table presents our net sales disaggregated by our principal markets, which disaggregation is consistent with other financial information utilized or provided outside of our consolidated financial statements:

	2020		2019		2018
	(Dollars In Thousands)
Net sales:
Agricultural products	$	180,036	$	187,641	$	187,164
Industrial products		133,024		139,643		148,598
Mining products		38,256		37,786		42,398
Total net sales	$	351,316	$	365,070	$	378,160