XML 45 R21.htm IDEA: XBRL DOCUMENT v2.3.0.15
Inventories (Tables)
9 Months Ended
Sep. 30, 2011
Inventories 
Schedule of inventories

 
  September 30,
2011
  December 31,
2010
 

Coal

  $ 166,739   $ 69,110  

Raw materials and supplies

    59,827     28,521  
           

Total inventories

  $ 226,566   $ 97,631