Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of Major Components of Inventories

The major components of inventories were as follows:

	March 31, 2020		December 31, 2019
Petroleum products	$	3,645	$	2,721
Crude oil	3,133		5,271
Caustic soda	5,821		5,965
NaHS	13,473		10,845
Raw materials - Alkali operations	5,999		6,238
Work-in-process - Alkali operations	8,399		8,579
Finished goods, net - Alkali operations	17,779		14,168
Materials and supplies, net - Alkali operations	11,912		11,350
Total	$	70,161	$	65,137