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Asset Retirement Obligation (Tables)
6 Months Ended
Jun. 30, 2014
Changes to Company's Asset Retirement Obligations

The following table describes the changes to the Company’s asset retirement obligations during the six months ended June 30, 2014 and 2013 (in thousands):

 

     Six Months Ended
June 30,
 
     2014     2013  

Balance at beginning of year

   $ 4,837      $ 4,422   

Liabilities incurred

     91        177   

Liabilities settled

     (31     (31

Accretion expense

     84        82   

Revision in estimated costs of plugging oil and natural gas wells

     20        —     
  

 

 

   

 

 

 

Asset retirement obligation at end of period

   $ 5,001      $ 4,650