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Additional Balance Sheet Detail and Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplemental Cash Flow Information [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] | Accrued liabilities and other consist of the following:
In thousands | December 31, 2020 |  | December 31, 2019
Accrued salaries and wages | $ | 30,457 |  |  | $ | 20,047 |
Silvertip contingent consideration | — |  |  | 25,000 |
Deferred revenue (1) | 16,425 |  |  | 16,672 |
Income and mining taxes | 26,118 |  |  | 11,243 |
Accrued operating costs | 3,327 |  |  | 3,752 |
Unrealized losses on derivatives | 24,950 |  |  | 411 |
Taxes other than income and mining | 3,616 |  |  | 3,554 |
Accrued interest payable | 1,855 |  |  | 1,833 |
Operating lease liabilities | 12,410 |  |  | 13,104 |
Accrued liabilities and other | $ | 119,158 |  |  | $ | 95,616 |
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 year ended December 31, 2020 and 2019:
In thousands |  |  |  |  | December 31, 2020 |  | December 31, 2019
Cash and cash equivalents |  |  |  |  | $ | 92,794 |  |  | $ | 55,645 |
Restricted cash equivalents |  |  |  |  | 1,376 |  |  | 1,373 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows |  |  |  |  | $ | 94,170 |  |  | $ | 57,018 |
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: | 2020 |  | 2019 |  | 2018
Finance lease obligations | $ | 5,283 |  |  | $ | 16,615 |  |  | $ | 45,813 |
Capital expenditures, not yet paid | $ | 30,682 |  |  | $ | 8,188 |  |  | $ | 6,428 |
Non-cash extinguishment of senior notes | $ | — |  |  | $ | 20,009 |  |  | $ | — |
Non-cash acquisitions and related deferred taxes | $ | — |  |  | $ | — |  |  | $ | 110,273 |
Non-cash Silvertip contingent consideration | $ | 5,295 |  |  | $ | 5,973 |  |  | $ | — |
Other cash flow information: |  |  |  |  |
Interest paid | $ | 20,634 |  |  | $ | 24,428 |  |  | $ | 22,916 |
Income taxes paid | $ | 35,600 |  |  | $ | 33,700 |  |  | $ | 50,400 |

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