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Supplemental Schedule of Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2012
Supplemental Schedule of Cash Flow Information [Abstract]  
Schedule of Supplemental Cash Flow Information
                 
    Six Months Ended
June 30,		  
    2012     2011  
    (In thousands)  
     

Capital leases issued for equipment

   $ 26,667     $ 24,104  

Asset retirement obligation additions

   $ 13     $ 11