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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation

The following is a reconciliation of our liability for plugging and abandonment costs as of December 31, 2016 and 2015 (in thousands):

 

2016

 

 

2015

 

 

Beginning of period

$

264,137

 

 

$

287,463

 

Liabilities incurred

 

2,694

 

 

 

4,595

 

Acquisitions

 

21,900

 

 

 

1,584

 

Liabilities settled

 

(11,511

)

 

 

(18,828

)

Disposition of wells

 

(10,540

)

 

 

(45,845

)

Accretion expense

 

18,021

 

 

 

19,163

 

Change in estimate

 

(26,758

)

 

 

16,005

 

End of period

 

257,943

 

 

 

264,137

 

 

Less current portion

 

(7,271

)

 

 

(15,071

)

 

Long-term asset retirement obligations

$

250,672

 

 

$

249,066