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

The following table describes the changes to the Company’s asset retirement obligations during the nine months ended September 30, 2012 and 2011 (in thousands):

 

     Nine Months Ended
September 30,
 
     2012     2011  

Balance at beginning of year

   $ 3,455      $ 3,063   

Liabilities incurred

     288        223   

Liabilities settled

     (106     (80

Accretion expense

     121        106   

Revision in estimated costs of plugging oil and natural gas wells

     536        (2
  

 

 

   

 

 

 

Asset retirement obligation at end of period

   $ 4,294      $ 3,310