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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2013
Asset Retirement Obligations

 

 

Six Months 

Ended
June 30, 2013

 

Beginning of period

$

  146,478

 

Liabilities incurred

 

  3,846

 

Liabilities settled

 

(155

)

Disposition of wells

 

(3,098

)

Accretion expense

 

  5,324

 

Change in estimate

 

(6,231

) 

End of period

 

  146,164

 

Less current portion

 

(2,366

)

Long-term asset retirement obligations

$

  143,798