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Note 14 - Unaudited Interim Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | $ 102,488 | $ 94,167 | $ 127,412 | $ 146,885
Other current assets | 41,498 | 15,972 |  |
Properties, plants, and equipment - net | 2,266 | 2,281 |  |
Intercompany receivable (payable) | 553,020 | 540,665 |  |
Investments in subsidiaries | 1,247,747 | 1,252,191 |  |
Other non-current assets | 2,518 | 2,200 |  |
Total assets | 1,949,537 | 1,907,476 |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 21,820 | 21,087 |  |
Long-term debt | 500,354 | 499,729 |  |
Non-current portion of accrued reclamation |  |  |  |
Non-current deferred tax liability |  |  |  |
Other non-current liabilities | 47,685 | 47,734 |  |
Stockholders' equity | 1,379,678 | 1,338,926 |  |
Total liabilities and stockholders' equity | 1,949,537 | 1,907,476 |  |
Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 23,720 | 42,692 | 55,906 | 33,824
Other current assets | 95,009 | 58,453 |  |
Properties, plants, and equipment - net | 1,167,053 | 1,147,770 |  |
Intercompany receivable (payable) | (342,822) | (301,291) |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 177,907 | 165,080 |  |
Total assets | 1,120,867 | 1,112,704 |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 82,221 | 84,559 |  |
Long-term debt | 5,079 | 6,128 |  |
Non-current portion of accrued reclamation | 43,381 | 45,494 |  |
Non-current deferred tax liability | 13,293 | 3,264 |  |
Other non-current liabilities | 5,937 | 5,834 |  |
Stockholders' equity | 970,956 | 967,425 |  |
Total liabilities and stockholders' equity | 1,120,867 | 1,112,704 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 17,405 | 18,350 | 8,256 | 28,956
Other current assets | 43,534 | 32,273 |  |
Properties, plants, and equipment - net | 756,839 | 746,760 |  |
Intercompany receivable (payable) | (329,269) | (332,553) |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 5,206 | 1,781 |  |
Total assets | 493,715 | 466,611 |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 50,845 | 30,636 |  |
Long-term debt | 2,237 | 3,183 |  |
Non-current portion of accrued reclamation | 29,638 | 29,055 |  |
Non-current deferred tax liability | 134,584 | 119,836 |  |
Other non-current liabilities | (380) | (865) |  |
Stockholders' equity | 276,791 | 284,766 |  |
Total liabilities and stockholders' equity | 493,715 | 466,611 |  |
Consolidation, Eliminations [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  |  |  |
Other current assets | (12,519) | 7,626 |  |
Properties, plants, and equipment - net |  |  |  |
Intercompany receivable (payable) | 119,071 | 93,179 |  |
Investments in subsidiaries | (1,247,747) | (1,252,191) |  |
Other non-current assets | (152,114) | (113,480) |  |
Total assets | (1,293,309) | (1,264,866) |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | (25,098) | (9,198) |  |
Long-term debt |  |  |  |
Non-current portion of accrued reclamation |  |  |  |
Non-current deferred tax liability | (20,464) | (3,477) |  |
Other non-current liabilities |  |  |  |
Stockholders' equity | (1,247,747) | (1,252,191) |  |
Total liabilities and stockholders' equity | (1,293,309) | (1,264,866) |  |
Consolidated [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 143,613 | 155,209 | 191,574 | 209,665
Other current assets | 167,522 | 114,324 |  |
Properties, plants, and equipment - net | 1,926,158 | 1,896,811 |  |
Intercompany receivable (payable) |  |  |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 33,517 | 55,581 |  |
Total assets | 2,270,810 | 2,221,925 |  |
Liabilities and Stockholders' Equity |  |  |  |
Current liabilities | 129,788 | 127,084 |  |
Long-term debt | 507,670 | 509,040 |  |
Non-current portion of accrued reclamation | 73,019 | 74,549 |  |
Non-current deferred tax liability | 127,413 | 119,623 |  |
Other non-current liabilities | 53,242 | 52,703 |  |
Stockholders' equity | 1,379,678 | 1,338,926 |  |
Total liabilities and stockholders' equity | 2,270,810 | 2,221,925 |  |
Cash and cash equivalents | 143,613 | 155,209 | $ 191,574 | $ 209,665
Other current assets | 7,999 | 9,453 |  |
Properties, plants, and equipment - net | 1,926,158 | 1,896,811 |  |
Other non-current assets | 3,638 | 2,783 |  |
Total assets | 2,270,810 | 2,221,925 |  |
Current liabilities | 129,788 | 127,084 |  |
Long-term debt | 500,354 | 500,199 |  |
Non-current deferred tax liability | 127,413 | 119,623 |  |
Other non-current liabilities | 5,362 | 6,190 |  |
Stockholders' equity | 1,379,678 | 1,338,926 |  |
Total liabilities and stockholders' equity | $ 2,270,810 | $ 2,221,925 |  |

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