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Asset Retirement Obligation | 9 Months Ended
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Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Asset Retirement Obligation The Company had a post-closure reclamation and site restoration obligation of $8,654 as of September 30, 2018. The following is a reconciliation of the total reclamation liability for asset retirement obligations:
Balance at December 31, 2017 | $ | 8,982 |
Additions and revisions of prior estimates | 1,561 |
Accretion expense | 330 |
Settlement of liability | (2,219 | )
Balance at September 30, 2018 | $ | 8,654 |

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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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