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Note 15 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 60,856 | $ 186,107 | $ 173,999 | $ 171,977
Other current assets | 137,473 | 135,129 |  |
Properties, plants, and equipment - net | 2,487,429 | 1,999,311 |  |
Intercompany receivable (payable) |  |  |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 24,500 | 24,611 |  |
Total assets | 2,710,258 | 2,345,158 |  |
Current liabilities | 132,456 | 112,130 |  |
Long-term debt | 542,705 | 508,422 |  |
Non-current portion of accrued reclamation | 99,314 | 79,366 |  |
Non-current deferred tax liability | 164,928 | 124,352 |  |
Other non-current liabilities | 48,786 | 59,611 |  |
Shareholders' equity | 1,722,069 | 1,461,277 |  |
Total liabilities and shareholders' equity | 2,710,258 | 2,345,158 |  |
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |
Cash and cash equivalents | 28,081 | 103,878 | 101,061 | 113,275
Other current assets | 15,219 | 47,555 |  |
Properties, plants, and equipment - net | 1,920 | 1,946 |  |
Intercompany receivable (payable) | 256,831 | 287,310 |  |
Investments in subsidiaries | 1,767,234 | 1,358,025 |  |
Other non-current assets | 149,034 | 14,409 |  |
Total assets | 2,218,319 | 1,813,123 |  |
Current liabilities | (79,535) | (226,576) |  |
Long-term debt | 534,067 | 502,229 |  |
Non-current portion of accrued reclamation |  |  |  |
Non-current deferred tax liability |  |  |  |
Other non-current liabilities | 41,718 | 53,588 |  |
Shareholders' equity | 1,722,069 | 1,483,882 |  |
Total liabilities and shareholders' equity | 2,218,319 | 1,813,123 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Cash and cash equivalents | 7,204 | 32,048 | 19,200 | 26,588
Other current assets | 42,515 | 47,608 |  |
Properties, plants, and equipment - net | 1,246,274 | 1,244,161 |  |
Intercompany receivable (payable) | (222,897) | (177,438) |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 4,390 | 7,289 |  |
Total assets | 1,076,480 | 1,152,636 |  |
Current liabilities | 77,328 | 66,550 |  |
Long-term debt | 4,911 | 2,303 |  |
Non-current portion of accrued reclamation | 67,145 | 67,565 |  |
Non-current deferred tax liability | 16,497 | 10,120 |  |
Other non-current liabilities | 5,784 | 5,185 |  |
Shareholders' equity | 904,815 | 1,000,913 |  |
Total liabilities and shareholders' equity | 1,076,480 | 1,152,636 |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Cash and cash equivalents | 26,581 | 51,213 | 53,738 | 32,114
Other current assets | 79,807 | 40,541 |  |
Properties, plants, and equipment - net | 1,239,235 | 753,204 |  |
Intercompany receivable (payable) | (138,477) | (341,182) |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 11,670 | 9,283 |  |
Total assets | 1,218,812 | 513,059 |  |
Current liabilities | 55,389 | 37,671 |  |
Long-term debt | 137,938 | 3,890 |  |
Non-current portion of accrued reclamation | 32,169 | 11,801 |  |
Non-current deferred tax liability | 159,613 | 124,352 |  |
Other non-current liabilities | 1,284 | 838 |  |
Shareholders' equity | 862,419 | 334,507 |  |
Total liabilities and shareholders' equity | 1,248,812 | 513,059 |  |
Consolidation, Eliminations [Member] |  |  |  |
Cash and cash equivalents |  |  |  |
Other current assets | (68) | (575) |  |
Properties, plants, and equipment - net |  |  |  |
Intercompany receivable (payable) | 104,543 | 231,310 |  |
Investments in subsidiaries | (1,767,234) | (1,358,025) |  |
Other non-current assets | (140,594) | (6,370) |  |
Total assets | (1,803,353) | (1,133,660) |  |
Current liabilities | 79,274 | 234,485 |  |
Long-term debt | (134,211) |  |  |
Non-current portion of accrued reclamation |  |  |  |
Non-current deferred tax liability | (11,182) | (10,120) |  |
Other non-current liabilities |  |  |  |
Shareholders' equity | (1,767,234) | (1,358,025) |  |
Total liabilities and shareholders' equity | $ (1,833,353) | $ (1,133,660) |  |

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