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Asset Retirement Obligations | 12 Months Ended
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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 |
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(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.

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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 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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