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Mine Closing, Reclamation, and Gas Well Closing (Tables) | 12 Months Ended
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Dec. 31, 2016
MINE CLOSING, RECLAMATION & GAS WELL CLOSING [Abstract] |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
|  | As of December 31,
|  | 2016 |  | 2015
Balance at beginning of period |  | $ | 429,967 |  |  | $ | 454,832 |
Accretion expense |  | 23,924 |  |  | 32,438 |
Payments |  | (15,882 | ) |  | (18,033 | )
Revisions in estimated cash flows |  | 36,320 |  |  | (33,984 | )
Other |  | (785 | ) |  | (5,286 | )
Balance at end of period |  | $ | 473,544 |  |  | $ | 429,967 |

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- Definition MINE CLOSING, RECLAMATION & GAS WELL CLOSING [Abstract] + 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://www.xbrl.org/2003/role/presentationRef -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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