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Inventories | 3 Months Ended
--- | ---
Mar. 31, 2016
Inventory Disclosure [Abstract] |
Inventories | Inventories The major components of inventories were as follows:
| March 31, 2016 |  | December 31, 2015
Petroleum products | $ | 6,300 |  |  | $ | 14,235 |
Crude oil | 50,431 |  |  | 22,815 |
Caustic soda | 2,906 |  |  | 3,964 |
NaHS | 3,953 |  |  | 2,755 |
Other | — |  |  | 6 |
Total | $ | 63,590 |  |  | $ | 43,775 |
Inventories are valued at the lower of cost or market. The market value of inventories were not below recorded cost as of March 31, 2016 and were below recorded costs by approximately $0.9 million as of December 31, 2015; therefore we reduced the value of inventory in our Condensed Consolidated Financial Statements for this difference in 2015.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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