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Inventories and natural gas in storage
3 Months Ended
Mar. 31, 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:
 
March 31, 2017

March 31, 2016

December 31, 2016

 
(In thousands)
Aggregates held for resale
$
120,392

$
127,101

$
115,471

Asphalt oil
50,538

52,065

29,103

Materials and supplies
22,074

21,645

18,372

Merchandise for resale
16,546

17,441

16,437

Natural gas in storage (current)
11,282

11,305

25,761

Other
29,777

30,199

33,129

Total
$
250,609

$
259,756

$
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 March 31, 2017 and 2016, and December 31, 2016, respectively.