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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2013
Asset Retirement Obligations

A reconciliation of our liability for plugging and abandonment costs for the years ended December 31, 2013 and 2012 is as follows (in thousands):

 

 

2013

 

 

2012

 

 

Beginning of period

$

146,478

 

 

$

84,810

 

Liabilities incurred

 

8,731

 

 

 

9,802

 

Liabilities settled

 

(424)

 

 

 

(3,649

)

Disposition of wells

 

(3,129

)

 

 

(1,457

)

Accretion expense

 

10,778

 

 

 

8,793

 

Change in estimate

 

67,643

 

 

 

48,179

 

End of period

 

230,077

 

 

 

146,478

 

 

Less current portion

 

(5,037

)

 

 

(2,470

)

 

Long-term asset retirement obligations

$

225,040

 

 

$

144,008