Net Sales (Tables)

3 Months Ended

Mar. 31, 2019

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:

	Three Months Ended March 31,
	2019		2018
	(Dollars In Thousands)
Net sales:
Agricultural products	$	46,820	$	52,269
Industrial acids and other chemical products		37,850		38,137
Mining products		9,482		10,044
Total net sales	$	94,152	$	100,450