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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net Income (Loss) | $ (84,217) | $ (37,348) | $ 35,095
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Depreciation, depletion and amortization | 163,672 | 145,147 | 172,651
Fair value adjustments, net | (2,925) | 24,182 | 15,040
Inventory adjustments | 20,819 | 2,646 | 6,524
Provision for reclamation and closure costs | 9,658 | 9,572 | 11,514
Deferred income taxes | (6,115) | (25,546) | (48,049)
Stock compensation | 6,598 | 6,012 | 6,082
Foreign exchange (gain) loss | 3,810 | (9,210) | (79)
Other non-cash items | 3,094 | 3,736 | 2,663
Increase (Decrease) in Operating Capital [Abstract] |  |  |
Accounts receivable | 25,133 | 8,669 | (5,405)
Inventories | (24,035) | (18,230) | 16,919
Other current and non-current assets | (32,456) | (12,388) | (1,678)
Accounts payable and accrued liabilities | 598 | (24,981) | (795)
Accrued payroll and related benefits | (4,982) | 13,732 | 1,270
Accrued taxes | (571) | (7,927) | 6,457
Accrued reclamation and closure costs and other non-current liabilities | (2,582) | 11,824 | 2,128
Net cash provided by operating activities | 75,499 | 89,890 | 220,337
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Additions to properties, plants, equipment and mineral interests | (223,887) | (149,378) | (109,048)
Pre-acquisition advance to Alexco | 0 | (25,000) | 0
Acquisition, net | 228 | 8,953 | 0
Purchase of carbon credits | 0 | 0 | (869)
Proceeds from sale or exchange of investments | 0 | 9,375 | 1,811
Proceeds from disposition of properties, plants, equipment and mineral interests | 1,329 | 748 | 1,077
Purchases of investments | (8,962) | (31,971) | 0
Net cash used in investing activities | (231,292) | (187,273) | (107,029)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from issuance of common stock, net of offering costs | 56,684 | 17,278 | 0
Dividends paid to common and preferred stockholders | (15,713) | (12,932) | (20,672)
Acquisition of treasury shares from employee equity awards | (2,036) | (3,677) | (4,525)
Borrowings of debt | 239,000 | 25,000 | 0
Repayments of debt | (111,000) | (25,000) | 0
Repayments of finance leases | (10,605) | (7,633) | (7,285)
Other | (0) | (536) | (116)
Net cash used in financing activities | 156,330 | (7,500) | (32,598)
Effect of exchange rates on cash | 1,095 | (273) | (530)
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents | 1,632 | (105,156) | 80,180
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year | 105,907 | 211,063 | 130,883
Cash, cash equivalents and restricted cash and cash equivalents at end of year | 107,539 | 105,907 | 211,063
Supplemental Cash Flow Information [Abstract] |  |  |
Interest | (37,744) | (37,200) | (37,565)
Income and mining taxes | 8,907 | 14,405 | 12,105
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Addition of finance lease obligations | 16,116 | 11,887 | 4,870
Recognition of operating lease liabilities and right-of-use assets | 203 | 6,842 | 4,874
Common stock contributed to pension plans | 1,035 | 9,740 | 22,250
Common stock issued for 401(k) match | 4,608 | 4,470 | 4,339
Common stock issued to settle acquired silver stream | 0 | 135,000 |
Equity securities received from exchange of investments | 0 | 0 | 3,626
Common stock issued to Alexco Resource Corp. stockholders |  |  |
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Common stock issued to Alexco Resource Corp. stockholders | 0 | 68,733 |
Common stock issued to ATAC Resources Ltd. stockholders |  |  |
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Common stock issued to Alexco Resource Corp. stockholders | $ 18,789 | $ 0 | $ 0

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