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Inventories and natural gas in storage | 3 Months Ended
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Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventories and natural gas in storage | Inventories and natural gas in storage Natural gas in storage for the Company's regulated operations is generally carried at lower of cost or net realizable value, or cost using the last-in, first-out method. All other inventories are stated at the lower of cost or net realizable value. The portion of the cost of natural gas in storage expected to be used within one year was included in inventories. Inventories on the Company's Consolidated Balance Sheets were as follows:
| March 31, 2018 |  | March 31, 2017 |  | December 31, 2017 |
| (In thousands)
Aggregates held for resale | $ | 123,053 |  | $ | 120,392 |  | $ | 115,268 |
Asphalt oil | 61,647 |  | 50,538 |  | 30,360 |
Materials and supplies | 19,493 |  | 22,074 |  | 18,650 |
Merchandise for resale | 16,378 |  | 16,546 |  | 14,905 |
Natural gas in storage (current) | 10,936 |  | 11,282 |  | 20,950 |
Other | 26,285 |  | 29,777 |  | 26,450 |
Total | $ | 257,792 |  | $ | 250,609 |  | $ | 226,583 |
The remainder of natural gas in storage, which largely represents the cost of gas required to maintain pressure levels for normal operating purposes, was included in deferred charges and other assets - other and was $47.8 million, $49.5 million and $49.3 million at March 31, 2018 and 2017, and December 31, 2017, respectively.

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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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