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Asset Retirement Obligation (Tables)
6 Months Ended
Jun. 30, 2011
Changes to the 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, 2011 and 2010 (in thousands):

 

     Six Months Ended
June 30,
 
     2011     2010  

Balance at beginning of year

   $ 3,063      $ 2,955   

Liabilities incurred

     152        142   

Liabilities settled

     (80     (184

Accretion expense

     70        55   

Revision in estimated costs of plugging oil and natural gas wells

     (2     —     
                

Asset retirement obligation at end of period

   $ 3,203      $ 2,968