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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Changes in Asset Retirement Obligations | The following table reflects the changes in the Company’s ARO during the nine months ended September 30, 2018:
| (In thousands)
Balance at December 31, 2017 | $ | 48,799 |
Liabilities incurred during period | 5,509 |
Liabilities settled during period | (4,904 | )
Accretion expense during period(1) | 1,975 |
Revisions to estimates | 83 |
Balance at September 30, 2018 | $ | 51,462 |
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(1) | Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statements of Operations.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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