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Inventories and natural gas in storage
6 Months Ended
Jun. 30, 2012
Inventories and natural gas in storage [Abstract]  
Inventories and natural gas in storage
Inventories and natural gas in storage
Inventories, other than natural gas in storage for the Company's regulated operations, were stated at the lower of average cost or market value. Natural gas in storage for the Company's regulated operations is generally carried at average cost, or cost using the last-in, first-out method. The portion of the cost of natural gas in storage expected to be used within one year was included in inventories. Inventories consisted of:
 
June 30,
2012
June 30,
2011
December 31,
2011
 
(In thousands)
Aggregates held for resale
$
90,992

$
82,936

$
78,518

Asphalt oil
81,915

55,729

32,335

Materials and supplies
72,321

65,363

61,611

Merchandise for resale
30,417

33,435

32,165

Natural gas in storage (current)
26,216

11,993

36,578

Other
31,531

27,871

32,998

Total
$
333,392

$
277,327

$
274,205



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 other assets and was $50.3 million, $47.2 million, and $50.3 million at June 30, 2012 and 2011, and December 31, 2011, respectively.