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Inventories | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories The major components of inventories were as follows:
| December 31,
| 2017 |  | 2016
Petroleum products | $ | 8,731 |  |  | $ | 11,550 |
Crude oil | 29,873 |  |  | 73,133 |
Caustic soda | 5,755 |  |  | 4,593 |
NaHS | 8,277 |  |  | 9,304 |
Raw materials - Alkali Operations | 4,550 |  |  | — |
Work-in-process - Alkali Operations | 7,355 |  |  | — |
Finished goods, net - Alkali Operations | 14,075 |  |  | — |
Materials and supplies, net - Alkali Operations | 10,030 |  |  | — |
Other | 7 |  |  | 7 |
Total | $ | 88,653 |  |  | $ | 98,587 |
Inventories are valued at the lower of cost or net realizable value. The net realizable value of inventories were no t recorded below cost as of December 31, 2017 and December 31, 2016. Materials and supplies include chemicals, maintenance supplies, and spare parts which will be consumed in the mining of trona ore and production of soda ash processes.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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