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Note 14 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Cash and cash equivalents | $ 32,995 |  | $ 27,389 |  |  |
Other current assets | 145,931 |  | 136,761 |  |  |
Properties, plants, equipment and mineral interests, net | 2,455,511 |  | 2,520,004 |  |  |
Intercompany receivable (payable) | 0 |  | 0 |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |
Other non-current assets | 38,741 |  | 19,790 |  |  |
Total assets | 2,673,178 |  | 2,703,944 |  |  |
Current liabilities | 145,843 |  | 136,194 |  |  |
Long-term debt | 604,653 |  | 540,670 |  |  |
Accrued reclamation and closure costs | 103,821 |  | 104,979 |  |  |
Non-current deferred tax liability | 143,442 |  | 173,537 |  |  |
Other non-current liabilities | 58,775 |  | 57,601 |  |  |
Shareholders' equity | 1,616,644 | $ 1,639,228 | 1,690,963 | $ 1,722,069 | $ 1,478,695 | $ 1,461,277
Total liabilities and shareholders' equity | 2,673,178 |  | 2,703,944 |  |  |
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |  |  |
Cash and cash equivalents | 18,983 |  | 6,266 |  |  |
Other current assets | 7,031 |  | 6,388 |  |  |
Properties, plants, equipment and mineral interests, net | 1,913 |  | 1,913 |  |  |
Intercompany receivable (payable) | 143,248 |  | 171,908 |  |  |
Investments in subsidiaries | 1,499,318 |  | 1,577,869 |  |  |
Other non-current assets | 284,380 |  | 276,641 |  |  |
Total assets | 1,954,873 |  | 2,040,985 |  |  |
Current liabilities | (298,754) |  | (233,824) |  |  |
Long-term debt | 584,618 |  | 532,799 |  |  |
Accrued reclamation and closure costs | 0 |  | 0 |  |  |
Non-current deferred tax liability | 0 |  | 0 |  |  |
Other non-current liabilities | 52,365 |  | 51,047 |  |  |
Shareholders' equity | 1,616,644 |  | 1,690,963 |  |  |
Total liabilities and shareholders' equity | 1,954,873 |  | 2,040,985 |  |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash and cash equivalents | 9,608 |  | 17,233 |  |  |
Other current assets | 113,542 |  | 105,900 |  |  |
Properties, plants, equipment and mineral interests, net | 2,438,137 |  | 2,503,467 |  |  |
Intercompany receivable (payable) | (709,012) |  | (546,374) |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |
Other non-current assets | 25,380 |  | 10,906 |  |  |
Total assets | 1,877,655 |  | 2,091,132 |  |  |
Current liabilities | 165,564 |  | 157,640 |  |  |
Long-term debt | 19,159 |  | 143,858 |  |  |
Accrued reclamation and closure costs | 95,674 |  | 100,445 |  |  |
Non-current deferred tax liability | 146,069 |  | 163,328 |  |  |
Other non-current liabilities | 5,393 |  | 5,641 |  |  |
Shareholders' equity | 1,445,796 |  | 1,520,220 |  |  |
Total liabilities and shareholders' equity | 1,877,655 |  | 2,091,132 |  |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash and cash equivalents | 4,404 |  | 3,890 |  |  |
Other current assets | 25,430 |  | 24,542 |  |  |
Properties, plants, equipment and mineral interests, net | 15,461 |  | 14,624 |  |  |
Intercompany receivable (payable) | 149,616 |  | 152,031 |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |
Other non-current assets | (120,645) |  | (124,845) |  |  |
Total assets | 74,266 |  | 70,242 |  |  |
Current liabilities | 10,704 |  | 7,145 |  |  |
Long-term debt | 876 |  | 1 |  |  |
Accrued reclamation and closure costs | 8,147 |  | 4,534 |  |  |
Non-current deferred tax liability | 0 |  | 0 |  |  |
Other non-current liabilities | 1,017 |  | 913 |  |  |
Shareholders' equity | 53,522 |  | 57,649 |  |  |
Total liabilities and shareholders' equity | 74,266 |  | 70,242 |  |  |
Consolidation, Eliminations [Member] |  |  |  |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Other current assets | (72) |  | (69) |  |  |
Properties, plants, equipment and mineral interests, net | 0 |  | 0 |  |  |
Intercompany receivable (payable) | 416,148 |  | 222,435 |  |  |
Investments in subsidiaries | (1,499,318) |  | (1,577,869) |  |  |
Other non-current assets | (150,374) |  | (142,912) |  |  |
Total assets | (1,233,616) |  | (1,498,415) |  |  |
Long-term debt | 0 |  | (135,988) |  |  |
Accrued reclamation and closure costs | 0 |  | 0 |  |  |
Non-current deferred tax liability | (2,627) |  |  |  |  |
Other non-current liabilities | 0 |  | 0 |  |  |
Shareholders' equity | (1,499,318) |  | (1,577,869) |  |  |
Total liabilities and shareholders' equity | (1,233,616) |  | (1,498,415) |  |  |
Segment Reconciling Items [Member] |  |  |  |  |  |
Current liabilities | $ 268,329 |  | 205,233 |  |  |
Non-current deferred tax liability |  |  | $ 10,209 |  |  |

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