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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
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, 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.