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Asset Retirement Obligations | 3 Months Ended
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Mar. 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 three months ended March 31, 2018:
| (In thousands)
Balance at December 31, 2017 | $ | 48,799 |
Liabilities incurred during period | 2,703 |
Liabilities settled during period | (1 | )
Accretion expense during period(1) | 665 |
Revisions to estimates | 84 |
Balance at March 31, 2018 | $ | 52,250 |
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(1) | Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statements of Operations.
At March 31, 2018, the current portion of the total ARO balance was approximately $0.3 million and was included in accrued liabilities on the Company’s Condensed 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 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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