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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2012
Schedule Of Changes In Asset Retirement Obligations
     (In thousands)  

Balance at December 31, 2011

   $ 13,075   

Liabilities incurred during period

     2,812   

Liabilities settled during period

     —     

Accretion expense during period (1)

     389   

Revisions to estimates

     984   
  

 

 

 

Balance at June 30, 2012

   $ 17,260   
  

 

 

 

 

(1) Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statement of Operations.