Inventories (Tables)

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Schedule of Major Components of Inventories

The major components of inventories were as follows:

	June 30, 2019		December 31, 2018
Petroleum products	$	13,884	$	12,203
Crude oil	21,231		8,379
Caustic soda	6,856		10,372
NaHS	7,277		12,400
Raw materials - Alkali operations	7,457		5,952
Work-in-process - Alkali operations	5,081		2,322
Finished goods, net - Alkali operations	11,172		11,402
Materials and supplies, net - Alkali operations	11,079		10,490
Other	57		11
Total	$	84,094	$	73,531