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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2015
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, 2015 and 2014:
| Year Ended December 31,
| 2015 |  | 2014
| (In thousands)
Asset retirement obligation — beginning of period | $ | 42,549 |  |  | $ | 36,458 |
Liabilities incurred during period | 1,245 |  |  | 5,376 |
Liabilities settled during period(1) | (218 | ) |  | (2,065 | )
Accretion expense during period(2) | 2,223 |  |  | 1,917 |
Revisions to estimates | 241 |  |  | 863 |
Liabilities held for sale(3) | (10,228 | ) |  | — |
Asset retirement obligation — end of period | $ | 35,812 |  |  | $ | 42,549 |
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(1) | Liabilities settled during the year ended December 31, 2014 include ARO related to the properties sold in the Sanish Divestiture.
(2) | Included in depreciation, depletion and amortization on the Company’s Consolidated Statement of Operations.
(3) | Represents ARO related to the properties held for sale as of December 31, 2015 (see Note 7 — Assets Held for Sale).
At both December 31, 2015 and 2014, 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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