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Asset Retirement Obligations (Tables)
3 Months Ended
Mar. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation

A reconciliation of our liability for plugging and abandonment costs for the three months ended March 31, 2018 is as follows (in thousands):

 

 

  

Three Months
Ended
March 31,

 2018

 

Beginning of period

  

$

276,855

 

Liabilities incurred

  

 

1,258

 

Liabilities settled

 

 

(829

)

Accretion expense

  

 

4,247

 

Change in estimate

  

 

3,805

 

End of period

  

 

285,336

 

Less current portion

  

 

(6,327

)

Long-term asset retirement obligations

  

$

279,009