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Additional Balance Sheet Detail and Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Information [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] | Accrued liabilities and other consist of the following:
| December 31, 2017 |  | December 31, 2016
Accrued salaries and wages | $ | 26,559 |  |  | $ | 20,895 |
Income and mining taxes | 25,788 |  |  | 3,721 |
Silvertip contingent consideration | 24,393 |  |  | — |
Accrued operating costs | 12,323 |  |  | 3,199 |
Taxes other than income and mining | 4,354 |  |  | 2,738 |
Accrued interest payable | 1,513 |  |  | 5,892 |
Accrued liabilities and other | $ | 94,930 |  |  | $ | 36,445 |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | The following table presents non-cash financing and investing activities and other cash flow information:
| Year ended December 31,
Non-cash financing and investing activities: | 2017 |  | 2016 |  | 2015
Capital lease obligations | $ | 34,604 |  |  | $ | 32,243 |  |  | $ | 4,123 |
Non-cash extinguishment of senior notes | — |  |  | 10,616 |  |  | 53,373 |
Non-cash acquisitions and related deferred taxes | 131,833 |  |  | — |  |  | 297,821 |
Other cash flow information: |  |  |  |  |
Interest paid | $ | 21,943 |  |  | $ | 41,919 |  |  | $ | 41,442 |
Income taxes paid | 13,000 |  |  | 17,181 |  |  | 1,937 |

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