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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016:
 
Year Ended December 31,
 
2017
 
2016
 
(In thousands)
Asset retirement obligation — beginning of period
$
49,687

 
$
35,812

Liabilities incurred during period(1)
2,449

 
11,811

Liabilities settled during period(2)
(5,743
)
 
(480
)
Accretion expense during period(1)(3)
2,621

 
1,973

Revisions to estimates
(215
)
 
571

Liabilities held for sale
—

 
—

Asset retirement obligation — end of period
$
48,799

 
$
49,687


__________________ 
(1)
Includes costs for wells acquired in the Williston Basin Acquisition (see Note 9 – Acquisitions and Divestitures) as of December 31, 2016.
(2)
Liabilities settled during the years ended December 31, 2017 and 2016 included ARO related to the sold properties (see Note 9 – Acquisitions and Divestitures).
(3)
Included in depreciation, depletion and amortization on the Company’s Consolidated Statements of Operations.
At December 31, 2017 and 2016, the current portion of the total ARO balance was approximately $0.3 million and $0.7 million, respectively, and is included in accrued liabilities on the Company’s Consolidated Balance Sheets.