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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
Year Ended December 31,
 
2018
 
2017
 
(In thousands)
Asset retirement obligation — beginning of period
$
48,799

 
$
49,687

Liabilities incurred during period(1)
5,854

 
2,449

Liabilities settled during period(2)
(4,944
)
 
(5,743
)
Accretion expense during period(1)(3)
2,657

 
2,621

Revisions to estimates
83

 
(215
)
Asset retirement obligation — end of period
$
52,449

 
$
48,799


__________________ 
(1)
Includes costs for wells acquired in the Permian Basin Acquisition (see Note 10 – Acquisitions) as of December 31, 2018.
(2)
Liabilities settled during the years ended December 31, 2018 and 2017 included ARO related to sold properties (see Note 11 – Divestitures).
(3)
Included in depreciation, depletion and amortization on the Company’s Consolidated Statements of Operations.
At December 31, 2018 and 2017, the current portion of the total ARO balance was approximately $0.1 million and $0.3 million, respectively, and is included in accrued liabilities on the Company’s Consolidated Balance Sheets.