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Inventories and natural gas in storage | 3 Months Ended
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Mar. 31, 2020
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 valued at lower of cost or market using the last-in, first-out method or lower of cost or net realizable value using the average cost or first-in, first-out method. The majority of all other inventories are valued at the lower of cost or net realizable value using the average cost method. The portion of the cost of natural gas in storage expected to be used within 12 months was included in inventories. Inventories on the Consolidated Balance Sheets were as follows:
| March 31, 2020 |  | March 31, 2019 |  | December 31, 2019 |
| (In thousands)
Aggregates held for resale | $ | 155,976 |  | $ | 142,747 |  | $ | 147,723 |
Asphalt oil | 73,842 |  | 83,459 |  | 41,912 |
Materials and supplies | 26,293 |  | 26,441 |  | 22,512 |
Merchandise for resale | 23,109 |  | 25,104 |  | 22,232 |
Natural gas in storage (current) | 7,872 |  | 11,464 |  | 22,058 |
Other | 18,866 |  | 22,320 |  | 21,970 |
Total | $ | 305,958 |  | $ | 311,535 |  | $ | 278,407 |
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 noncurrent assets - other and was $48.3 million, $48.2 million and $48.4 million at March 31, 2020 and 2019, and December 31, 2019, 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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