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Inventories
6 Months Ended
Jun. 30, 2011
Inventories [Abstract]  
INVENTORIES
3.   INVENTORIES
Inventories consisted of the following:
                 
    June 30,     December 31,  
    2011     2010  
    (In thousands)  
Coal stockpiles
  $ 546     $ 678  
Coal fuel inventories
    3,095       1,936  
Materials and supplies
    22,714       21,538  
Reserve for obsolete inventory
    (578 )     (581 )
 
           
Total
  $ 25,777     $ 23,571