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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes in Asset Retirement Obligations
The following table reflects the changes in the Company’s ARO during the years ended December 31, 2014 and 2013:

 
Year Ended December 31,
 
2014
 
2013(1)
 
(In thousands)
Asset retirement obligation — beginning of period
$
36,458

 
$
23,234

Liabilities incurred during period
5,376

 
11,665

Liabilities settled during period(2)
(2,065
)
 

Accretion expense during period(3)
1,917

 
1,346

Revisions to estimates
863

 
213

Asset retirement obligation — end of period
$
42,549

 
$
36,458


__________________ 
(1)
Includes ARO for wells acquired in the 2013 Acquisitions (See Note 6 — Acquisitions).
(2)
Liabilities settled during period include ARO related to the properties sold in the Sanish Divestiture.
(3)
Included in depreciation, depletion and amortization on the Company’s Consolidated Statement of Operations.