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Asset Retirement Obligations | 12 Months Ended
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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 |
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(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 end ed December 31, 2017 and 2 016 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.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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