Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of Major Components of Inventories

The major components of inventories were as follows:

	September 30, 2018		December 31, 2017
Petroleum products	$	21,082	$	8,731
Crude oil	16,493		29,873
Caustic soda	8,030		5,755
NaHS	9,682		8,277
Raw materials - Alkali operations	5,592		4,550
Work-in-process - Alkali operations	2,820		7,355
Finished goods, net - Alkali operations	11,526		14,075
Materials and supplies, net - Alkali operations	10,496		10,030
Other	1		7
Total	$	85,722	$	88,653