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Additional Balance Sheet Detail and Supplemental Cash Flow Information (Tables) | 9 Months Ended
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Sep. 30, 2021
Supplemental Cash Flow Information [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] | Accrued liabilities and other consist of the following:
In thousands | September 30, 2021 |  | December 31, 2020
Accrued salaries and wages | $ | 28,788 |  |  | $ | 30,457 |
Deferred revenue (1) | 8,673 |  |  | 16,425 |
Income and mining taxes | 14,078 |  |  | 26,118 |
Accrued operating costs | 8,468 |  |  | 3,327 |
Unrealized losses on derivatives | 255 |  |  | 24,950 |
Taxes other than income and mining | 3,053 |  |  | 3,616 |
Accrued interest payable | 3,273 |  |  | 1,855 |
Operating lease liabilities | 11,202 |  |  | 12,410 |
Accrued liabilities and other | $ | 77,790 |  |  | $ | 119,158 |
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 total the same such amounts shown in the statement of cash flows in the three and nine months ended September 30, 2021 and 2020:
In thousands |  |  |  |  | September 30, 2021 |  | September 30, 2020
Cash and cash equivalents |  |  |  |  | $ | 85,020 |  |  | $ | 77,148 |
Restricted cash equivalents |  |  |  |  | 1,771 |  |  | 1,380 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows |  |  |  |  | $ | 86,791 |  |  | $ | 78,528 |

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