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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
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.
At both December 31, 2014 and 2013, the current portion of the total ARO balance was approximately $0.5 million and is included in accrued liabilities on the Company’s Consolidated Balance Sheet.