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Asset Retirement Obligation (Tables)
6 Months Ended
Jun. 30, 2012
Changes to Company's Asset Retirement Obligations

the consolidated balance sheet. The following table describes the changes to the Company’s asset retirement obligations during the six months ended June 30, 2012 and 2011 (in thousands):

 

     Six Months Ended
June 30,
 
     2012     2011  

Balance at beginning of year

   $ 3,455      $ 3,063   

Liabilities incurred

     182        152   

Liabilities settled

     (83     (80

Accretion expense

     79        70   

Revision in estimated costs of plugging oil and natural gas wells

     536        (2
  

 

 

   

 

 

 

Asset retirement obligation at end of period

   $ 4,169      $ 3,203