Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Schedule of Major Components of Inventories

The major components of inventories were as follows:

	March 31, 2019		December 31, 2018
Petroleum products	$	4,585	$	12,203
Crude oil	24,238		8,379
Caustic soda	8,040		10,372
NaHS	8,632		12,400
Raw materials - Alkali operations	6,401		5,952
Work-in-process - Alkali operations	6,343		2,322
Finished goods, net - Alkali operations	10,941		11,402
Materials and supplies, net - Alkali operations	10,967		10,490
Other	—		11
Total	$	80,147	$	73,531