Inventories

The major components of inventories were as follows:



	September 30, 2017		December 31, 2016
Petroleum products	$	2,618	$	11,550
Crude oil	46,035		73,133
Caustic soda	5,381		4,593
NaHS	11,176		9,304
Raw materials - Alkali Operations	4,560		—
Work-in-process - Alkali Operations	4,751		—
Finished goods, net - Alkali Operations	14,197		—
Materials and supplies, net - Alkali Operations	9,840		—
Other	—		7
Total	$	98,558	$	98,587

Inventories are valued at the lower of cost or net realizable value. The net realizable value of inventories were not recorded below cost as of September 30, 2017 and December 31, 2016.