Inventories (Tables)

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Schedule of Major Components of Inventories

The major components of inventories were as follows:

	March 31, 2021		December 31, 2020
Petroleum products	$	2,584	$	5,840
Crude oil	14,633		37,661
Caustic soda	5,108		5,167
NaHS	7,736		9,101
Raw materials - Alkali operations	6,492		7,120
Work-in-process - Alkali operations	10,700		9,355
Finished goods, net - Alkali operations	11,988		13,002
Materials and supplies, net - Alkali operations	13,186		12,631
Total	$	72,427	$	99,877