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Inventories and natural gas in storage | 6 Months Ended
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Jun. 30, 2017
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 is included in inventories. Inventories consisted of:
| June 30, 2017 |  | June 30, 2016 |  | December 31, 2016 |
| (In thousands)
Aggregates held for resale | $ | 123,316 |  | $ | 130,544 |  | $ | 115,471 |
Asphalt oil | 46,852 |  | 42,591 |  | 29,103 |
Materials and supplies | 22,657 |  | 20,765 |  | 18,372 |
Merchandise for resale | 16,164 |  | 18,439 |  | 16,437 |
Natural gas in storage (current) | 14,126 |  | 19,689 |  | 25,761 |
Other | 26,755 |  | 33,821 |  | 33,129 |
Total | $ | 249,870 |  | $ | 265,849 |  | $ | 238,273 |
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 $49.5 million, $49.1 million and $49.5 million at June 30, 2017 and 2016, and December 31, 2016, 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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