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Additional Balance Sheet Detail and Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 31, 2018
Supplemental Cash Flow Information [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] | Accrued liabilities and other consist of the following:
| March 31, 2018 |  | December 31, 2017
Accrued salaries and wages | $ | 15,552 |  |  | $ | 26,559 |
Income and mining taxes | 36,642 |  |  | 25,788 |
Silvertip contingent consideration | 24,543 |  |  | 24,393 |
Accrued operating costs | 17,174 |  |  | 12,323 |
Taxes other than income and mining | 5,644 |  |  | 4,354 |
Accrued interest payable | 5,594 |  |  | 1,513 |
Accrued liabilities and other | $ | 105,149 |  |  | $ | 94,930 |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the statement of financial position that sum to the total of the same such amounts shown in the statement of cash flows:
| March 31, 2018 |  | March 31, 2017
Cash and cash equivalents | $ | 159,643 |  |  | $ | 160,636 |
Restricted cash equivalents | 12,458 |  |  | 9,821 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows | 172,101 |  |  | 170,457 |

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