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INVENTORIES | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
INVENTORIES | INVENTORIES Inventories consisted of the following:
| December 31,
| 2017 |  | 2016
| (Thousands of Dollars)
Petroleum products | $ | 17,027 |  |  | $ | 28,044 |
Materials and supplies | 9,830 |  |  | 9,901 |
Total | $ | 26,857 |  |  | $ | 37,945 |
We purchase petroleum products for resale. Our petroleum products consist of intermediates, gasoline, distillates and other petroleum products. Materials and supplies mainly con sist of blending and additive chemicals and maintenance materials used in our pipeline and storage segments.

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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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