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

 

     Nine Months  Ended
September 30,
 
     2011     2010  

Balance at beginning of year

   $ 3,063      $ 2,955   

Liabilities incurred

     223        279   

Liabilities settled

     (80     (331

Accretion expense

     106        83   

Revision in estimated costs of plugging oil and natural gas wells

     (2     —     
  

 

 

   

 

 

 

Asset retirement obligation at end of period

   $ 3,310      $ 2,986