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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Asset Retirement Obligation The Company had a post-closure reclamation and site restoration obligation of $6,142 as of December 31, 2019. 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 | 7,546 |
Accretion expenses | (26) |
Settlement of liability | (3,180) |
Balance at December 31, 2018 | $ | 13,322 |
Additions and revisions of prior estimates | (5,114) |
Accretion expenses | 687 |
Settlement of liability | (2,753) |
Balance at December 31, 2019 | $ | 6,142 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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