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Note 16 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 186,107 | $ 169,777 | $ 155,209 | $ 209,665
Other current assets | 134,218 | 121,314 |  |
Properties, plants, and equipment - net | 2,020,021 | 2,032,685 |  |
Intercompany receivable (payable) |  |  |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 24,611 | 47,901 |  |
Identifiable assets | 2,364,957 | 2,371,677 | 2,221,925 |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 112,130 | 126,225 |  |
Long-term debt | 508,422 | 506,817 |  |
Reclamation and closure costs, long-term | 79,366 | 79,927 |  |
Deferred tax liability | 121,546 | 122,855 |  |
Other non-current liabilities | 59,611 | 56,009 |  |
Stockholders' equity | 1,483,882 | 1,479,844 | 1,338,926 | 1,396,974
Total liabilities and shareholders' equity | 2,364,957 | 2,371,677 |  |
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 103,878 | 113,275 | 94,167 | 146,885
Other current assets | 47,555 | 33,950 |  |
Properties, plants, and equipment - net | 1,946 | 2,103 |  |
Intercompany receivable (payable) | 287,310 | 404,121 |  |
Investments in subsidiaries | 1,358,025 | 1,496,787 |  |
Other non-current assets | 14,409 | 4,186 |  |
Identifiable assets | 1,813,123 | 2,054,422 |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | (226,576) | 22,401 |  |
Long-term debt | 502,229 | 500,979 |  |
Reclamation and closure costs, long-term |  |  |  |
Deferred tax liability |  |  |  |
Other non-current liabilities | 53,588 | 51,198 |  |
Stockholders' equity | 1,483,882 | 1,479,844 |  |
Total liabilities and shareholders' equity | 1,813,123 | 2,054,422 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 31,016 | 24,388 | 42,692 | 33,824
Other current assets | 47,608 | 52,400 |  |
Properties, plants, and equipment - net | 1,244,161 | 1,258,890 |  |
Intercompany receivable (payable) | (177,438) | (222,072) |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 7,289 | 199,957 |  |
Identifiable assets | 1,152,636 | 1,313,563 |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 66,550 | 86,730 |  |
Long-term debt | 2,303 | 3,065 |  |
Reclamation and closure costs, long-term | 67,565 | 63,025 |  |
Deferred tax liability | 10,120 | 14,212 |  |
Other non-current liabilities | 5,185 | 5,108 |  |
Stockholders' equity | 1,000,913 | 1,141,423 |  |
Total liabilities and shareholders' equity | 1,152,636 | 1,313,563 |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 51,213 | 32,114 | 18,350 | 28,956
Other current assets | 39,630 | 35,537 |  |
Properties, plants, and equipment - net | 773,914 | 771,692 |  |
Intercompany receivable (payable) | (341,182) | (307,018) |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 9,283 | 5,337 |  |
Identifiable assets | 532,858 | 537,662 |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 37,671 | 40,093 |  |
Long-term debt | 3,890 | 2,773 |  |
Reclamation and closure costs, long-term | 11,801 | 16,902 |  |
Deferred tax liability | 121,546 | 122,855 |  |
Other non-current liabilities | 838 | (325) |  |
Stockholders' equity | 357,112 | 355,364 |  |
Total liabilities and shareholders' equity | 532,858 | 537,662 |  |
Consolidation, Eliminations [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Other current assets | (575) | (573) |  |
Properties, plants, and equipment - net |  |  |  |
Intercompany receivable (payable) | 231,310 | 124,969 |  |
Investments in subsidiaries | (1,358,025) | (1,496,787) |  |
Other non-current assets | (6,370) | (161,579) |  |
Identifiable assets | (1,133,660) | (1,533,970) |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 234,485 | (22,999) |  |
Long-term debt |  |  |  |
Reclamation and closure costs, long-term |  |  |  |
Deferred tax liability | (10,120) | (14,212) |  |
Other non-current liabilities |  | 28 |  |
Stockholders' equity | (1,358,025) | (1,496,787) |  |
Total liabilities and shareholders' equity | $ (1,133,660) | $ (1,533,970) |  |

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