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Inventories and natural gas in storage
6 Months Ended
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.