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Note 13 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 215,715 | $ 62,452 |  |
Other current assets | 126,827 | 116,672 |  |
Properties, plants, equipment and mineral interests, net | 2,393,187 | 2,423,698 |  |
Intercompany receivable (payable) | 0 | 0 |  |
Investments in subsidiaries | 0 | 0 |  |
Other non-current assets | 28,395 | 34,486 |  |
Total assets | 2,764,124 | 2,637,308 |  |
Current liabilities | 117,183 | 116,974 |  |
Long-term debt | 694,970 | 522,761 |  |
Accrued reclamation and closure costs | 97,509 | 103,793 |  |
Non-current deferred tax liability | 126,237 | 138,282 |  |
Other non-current liabilities | 71,342 | 63,075 |  |
Stockholders' equity | 1,656,883 | 1,692,423 | $ 1,670,570 | $ 1,690,963
Total liabilities and shareholders' equity | 2,764,124 | 2,637,308 |  |
Reportable Legal Entities [Member] | Parent Company [Member] |  |  |  |
Cash and cash equivalents | 190,274 | 33,750 |  |
Other current assets | 19,131 | 9,725 |  |
Properties, plants, equipment and mineral interests, net | 1,913 | 1,913 |  |
Intercompany receivable (payable) | (15,844) | (28,381) |  |
Investments in subsidiaries | 1,648,133 | 1,636,802 |  |
Other non-current assets | 263,344 | 289,422 |  |
Total assets | 2,106,951 | 1,943,231 |  |
Current liabilities | (292,781) | (309,293) |  |
Long-term debt | 679,021 | 504,729 |  |
Accrued reclamation and closure costs | 0 | 0 |  |
Non-current deferred tax liability | 0 | 0 |  |
Other non-current liabilities | 63,828 | 55,372 |  |
Stockholders' equity | 1,656,883 | 1,692,423 |  |
Total liabilities and shareholders' equity | 2,106,951 | 1,943,231 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Cash and cash equivalents | 16,984 | 15,357 |  |
Other current assets | 95,981 | 89,722 |  |
Properties, plants, equipment and mineral interests, net | 2,380,598 | 2,410,458 |  |
Intercompany receivable (payable) | (565,090) | (579,830) |  |
Investments in subsidiaries | 0 | 0 |  |
Other non-current assets | 24,970 | 24,325 |  |
Total assets | 1,953,443 | 1,960,032 |  |
Current liabilities | 154,776 | 155,441 |  |
Long-term debt | 15,406 | 17,271 |  |
Accrued reclamation and closure costs | 91,478 | 96,389 |  |
Non-current deferred tax liability | 154,664 | 166,549 |  |
Other non-current liabilities | 6,575 | 6,577 |  |
Stockholders' equity | 1,530,544 | 1,517,805 |  |
Total liabilities and shareholders' equity | 1,953,443 | 1,960,032 |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |
Cash and cash equivalents | 8,457 | 13,345 |  |
Other current assets | 11,788 | 17,299 |  |
Properties, plants, equipment and mineral interests, net | 10,676 | 11,327 |  |
Intercompany receivable (payable) | 224,183 | 216,632 |  |
Investments in subsidiaries | 0 | 0 |  |
Other non-current assets | (124,320) | (121,981) |  |
Total assets | 130,784 | 136,622 |  |
Current liabilities | 5,682 | 8,334 |  |
Long-term debt | 543 | 761 |  |
Accrued reclamation and closure costs | 6,031 | 7,404 |  |
Non-current deferred tax liability | 0 | 0 |  |
Other non-current liabilities | 939 | 1,126 |  |
Stockholders' equity | 117,589 | 118,997 |  |
Total liabilities and shareholders' equity | 130,784 | 136,622 |  |
Consolidation, Eliminations [Member] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Other current assets | (73) | (74) |  |
Properties, plants, equipment and mineral interests, net | 0 | 0 |  |
Intercompany receivable (payable) | 356,751 | 391,579 |  |
Investments in subsidiaries | (1,648,133) | (1,636,802) |  |
Other non-current assets | (135,599) | (157,280) |  |
Total assets | (1,427,054) | (1,402,577) |  |
Current liabilities | 249,506 | 262,492 |  |
Long-term debt | 0 | 0 |  |
Accrued reclamation and closure costs | 0 | 0 |  |
Non-current deferred tax liability | (28,427) | (28,267) |  |
Other non-current liabilities | 0 | 0 |  |
Stockholders' equity | (1,648,133) | (1,636,802) |  |
Total liabilities and shareholders' equity | $ (1,427,054) | $ (1,402,577) |  |

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