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Inventories and natural gas in storage (Tables)
6 Months Ended
Jun. 30, 2011
Inventories and natural gas in storage [Abstract]  
Inventories
Inventories consisted of:
 
 
   
June 30,
2011
  
June 30,
2010
  
December 31,
2010
 
   
(In thousands)
 
Aggregates held for resale
 $82,936  $83,535  $79,894 
Materials and supplies
  65,363   62,070   57,324 
Natural gas in storage (current)
  11,993   14,269   34,557 
Merchandise for resale
  33,435   28,438   30,182 
Asphalt oil
  55,729   51,956   25,234 
Other
  27,871   19,895   25,706 
Total
 $277,327  $260,163  $252,897