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v3.19.3.a.u2

ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2019
ASSET RETIREMENT OBLIGATIONS |
Schedule of activity affecting the asset retirement and mine closing liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2019 |  | 2018 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | $ | 137,114 | ​ | $ | 130,600 | ​
Accretion expense | ​ |  | 4,087 | ​ |  | 3,926 | ​
Payments | ​ |  | (2,948) | ​ |  | (2,392) | ​
Allocation of liability associated with acquisitions, mine development and change in assumptions | ​ |  | (739) | ​ |  | 4,980 | ​
Ending balance | ​ | $ | 137,514 | ​ | $ | 137,114 | ​
Schedule of estimated payments of asset retirement obligations | ​
​ | ​ | ​ | ​ | ​
Year Ended | ​ | ​ | ​ | ​
December 31, |  | (in thousands) |
​ | ​ | ​ | ​ | ​
2020 | ​ | $ | 4,496 | ​
2021 | ​ |  | 2,576 | ​
2022 | ​ |  | 2,794 | ​
2023 | ​ |  | 2,027 | ​
2024 | ​ |  | 2,986 | ​
Thereafter | ​ |  | 225,584 | ​
Aggregate undiscounted asset retirement obligations | ​ |  | 240,463 | ​
Effect of discounting | ​ |  | (102,949) | ​
Total asset retirement obligations | ​ |  | 137,514 | ​
Less: current portion | ​ |  | (4,496) | ​
Asset retirement obligations | ​ | $ | 133,018 | ​

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- Definition Tabular disclosure of estimated future payments of asset retirement obligations for each of the five succeeding fiscal years and thereafter. + References No definition available. + Details
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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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