XML 103 R18.htm IDEA: XBRL DOCUMENT v2.4.0.6
Inventories
12 Months Ended
Dec. 31, 2012
Inventories  
Inventories

NOTE 9—Inventories

        Inventories are summarized as follows (in thousands):

 
  December 31,  
 
  2012   2011  

Coal

  $ 228,910   $ 180,537  

Raw materials and supplies

    77,108     59,900  
           

Total inventories

  $ 306,018   $ 240,437