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Note 14 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Identifiable assets: |  |
Cash and cash equivalents | $ 212,569 | $ 186,107
Other current assets | 153,536 | 134,218
Properties, plants, and equipment - net | 2,008,704 | 2,020,021
Intercompany receivable (payable) |  |
Investments in subsidiaries |  |
Other non-current assets | 23,282 | 24,611
Identifiable assets | 2,398,091 | 2,364,957
Liabilities and Stockholders' Equity |  |
Current liabilities | 115,934 | 112,130
Long-term debt | 540,660 | 508,422
Accrued reclamation and closure costs | 78,887 | 79,366
Non-current deferred tax liability | 116,866 | 121,546
Other non-current liabilities | 51,243 | 59,611
Stockholders' equity | 1,494,501 | 1,483,882
Total liabilities and shareholders' equity | 2,398,091 | 2,364,957
Reportable Legal Entities [Member] | Parent Company [Member] |  |
Identifiable assets: |  |
Cash and cash equivalents | 137,504 | 103,878
Other current assets | 48,067 | 47,555
Properties, plants, and equipment - net | 1,934 | 1,946
Intercompany receivable (payable) | 293,972 | 287,310
Investments in subsidiaries | 1,373,604 | 1,358,025
Other non-current assets | 13,807 | 14,409
Identifiable assets | 1,868,888 | 1,813,123
Liabilities and Stockholders' Equity |  |
Current liabilities | (203,947) | (226,576)
Long-term debt | 533,566 | 502,229
Accrued reclamation and closure costs |  |
Non-current deferred tax liability |  |
Other non-current liabilities | 44,768 | 53,588
Stockholders' equity | 1,494,501 | 1,483,882
Total liabilities and shareholders' equity | 1,868,888 | 1,813,123
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |
Identifiable assets: |  |
Cash and cash equivalents | 21,096 | 31,016
Other current assets | 55,771 | 47,608
Properties, plants, and equipment - net | 1,241,325 | 1,244,161
Intercompany receivable (payable) | (163,503) | (177,438)
Investments in subsidiaries |  |
Other non-current assets | 7,370 | 7,289
Identifiable assets | 1,162,059 | 1,152,636
Liabilities and Stockholders' Equity |  |
Current liabilities | 67,735 | 66,550
Long-term debt | 3,682 | 2,303
Accrued reclamation and closure costs | 66,614 | 67,565
Non-current deferred tax liability | 11,630 | 10,120
Other non-current liabilities | 5,384 | 5,185
Stockholders' equity | 1,007,014 | 1,000,913
Total liabilities and shareholders' equity | 1,162,059 | 1,152,636
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |
Identifiable assets: |  |
Cash and cash equivalents | 53,969 | 51,213
Other current assets | 49,767 | 39,630
Properties, plants, and equipment - net | 765,445 | 773,914
Intercompany receivable (payable) | (338,811) | (341,182)
Investments in subsidiaries |  |
Other non-current assets | 8,325 | 9,283
Identifiable assets | 538,695 | 532,858
Liabilities and Stockholders' Equity |  |
Current liabilities | 38,776 | 37,671
Long-term debt | 3,412 | 3,890
Accrued reclamation and closure costs | 12,273 | 11,801
Non-current deferred tax liability | 116,553 | 121,546
Other non-current liabilities | 1,091 | 838
Stockholders' equity | 366,590 | 357,112
Total liabilities and shareholders' equity | 538,695 | 532,858
Consolidation, Eliminations [Member] |  |
Identifiable assets: |  |
Cash and cash equivalents |  |
Other current assets | (69) | (575)
Properties, plants, and equipment - net |  |
Intercompany receivable (payable) | 208,342 | 231,310
Investments in subsidiaries | (1,373,604) | (1,358,025)
Other non-current assets | (6,220) | (6,370)
Identifiable assets | (1,171,551) | (1,133,660)
Liabilities and Stockholders' Equity |  |
Current liabilities | 213,370 | 234,485
Long-term debt |  |
Accrued reclamation and closure costs |  |
Non-current deferred tax liability | (11,317) | (10,120)
Other non-current liabilities |  |
Stockholders' equity | (1,373,604) | (1,358,025)
Total liabilities and shareholders' equity | $ (1,171,551) | $ (1,133,660)

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