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Supplemental Guarantor Information Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 192,032 | $ 118,312 |  |
Receivables | 19,069 | 53,415 |  |
Ore on leach pads | 73,752 | 64,167 |  |
Inventory, Net | 58,230 | 93,436 |  |
Prepaid expenses and other | 15,053 | 10,015 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 91,421 | 71,442 |  |
Current assets | 449,557 | 410,787 |  |
Property, plant and equipment, net | 254,737 | 193,423 |  |
Mining properties, net | 829,569 | 550,290 |  |
Ore on leach pads | 65,393 | 67,231 |  |
Restricted assets | 20,847 | 17,597 |  |
Equity and debt securities | 34,837 | 4,488 |  |
Receivables | 28,750 | 13,745 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 0 | 0 |  |
Other Assets, Noncurrent | 17,485 | 12,585 |  |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent | 0 | 48,763 |  |
TOTAL ASSETS | 1,701,175 | 1,318,909 |  |
Accounts payable | 48,592 | 44,660 |  |
Accrued liabilities and other | 94,930 | 36,445 |  |
Debt | 30,753 | 11,955 |  |
Royalty obligations | 0 | 4,995 |  |
Reclamation | 3,777 | 3,109 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 50,677 | 15,470 |  |
Liabilities, Current | 228,729 | 116,634 |  |
Debt | 380,569 | 198,682 |  |
Royalty obligations | 0 | 4,292 |  |
Reclamation | 117,055 | 85,592 |  |
Deferred tax liabilities | 105,148 | 69,811 |  |
Other long-term liabilities | 54,697 | 41,654 |  |
Intercompany Payable Receivable | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent | 0 | 33,757 |  |
Non-current liabilities | 657,469 | 433,788 |  |
Common stock, par value $0.01 per share; authorized 300,000,000 shares, issued and outstanding 185,637,724 at December 31, 2017 and 180,933,287 at December 31, 2016 | 1,856 | 1,809 |  |
Additional paid-in capital | 3,357,345 | 3,314,590 |  |
Accumulated deficit | (2,546,743) | (2,545,424) |  |
Accumulated other comprehensive income (loss) | 2,519 | (2,488) |  |
Stockholders' equity | 814,977 | 768,487 | $ 421,476 | $ 554,328
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,701,175 | 1,318,909 |  |
Accrued Income Taxes, Current | 25,788 | 3,721 |  |
Interest Payable, Current | 1,513 | 5,892 |  |
Parent Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 44,662 | 58,048 |  |
Receivables | 137 | 12 |  |
Ore on leach pads | 0 | 0 |  |
Inventory, Net | 0 | 0 |  |
Prepaid expenses and other | 7,824 | 3,803 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 0 |  |
Current assets | 52,623 | 61,863 |  |
Property, plant and equipment, net | 4,007 | 3,222 |  |
Mining properties, net | 0 | 0 |  |
Ore on leach pads | 0 | 0 |  |
Restricted assets | 13,251 | 10,170 |  |
Equity and debt securities | 33,569 | 0 |  |
Receivables | 0 | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 422,074 | 273,056 |  |
Other Assets, Noncurrent | 320,335 | 221,381 |  |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  | 0 |  |
TOTAL ASSETS | 845,859 | 569,692 |  |
Accounts payable | 3,607 | 2,153 |  |
Accrued liabilities and other | 13,205 | 12,881 |  |
Debt | 0 | 0 |  |
Royalty obligations | 0 | 0 |  |
Reclamation | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 0 | 0 |  |
Liabilities, Current | 16,812 | 15,034 |  |
Debt | 345,088 | 175,991 |  |
Royalty obligations |  | 0 |  |
Reclamation | 0 | 0 |  |
Deferred tax liabilities | 4,110 | 13,810 |  |
Other long-term liabilities | 2,311 | 1,993 |  |
Intercompany Payable Receivable | (337,439) | (405,623) |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 |  |
Non-current liabilities | 14,070 | (213,829) |  |
Common stock, par value $0.01 per share; authorized 300,000,000 shares, issued and outstanding 185,637,724 at December 31, 2017 and 180,933,287 at December 31, 2016 | 1,856 | 1,809 |  |
Additional paid-in capital | 3,357,345 | 3,314,590 |  |
Accumulated deficit | (2,546,743) | (2,545,424) |  |
Accumulated other comprehensive income (loss) | 2,519 | (2,488) |  |
Stockholders' equity | 814,977 | 768,487 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 845,859 | 569,692 |  |
Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 52,239 | 50,023 |  |
Receivables | 7,922 | 6,865 |  |
Ore on leach pads | 73,752 | 64,167 |  |
Inventory, Net | 29,769 | 49,393 |  |
Prepaid expenses and other | 2,816 | 1,459 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 0 |  |
Current assets | 166,498 | 171,907 |  |
Property, plant and equipment, net | 161,487 | 139,885 |  |
Mining properties, net | 216,281 | 195,791 |  |
Ore on leach pads | 65,393 | 67,231 |  |
Restricted assets | 227 | 226 |  |
Equity and debt securities | 1,268 | 4,488 |  |
Receivables | 0 | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 223 | 11,650 |  |
Other Assets, Noncurrent | 11,040 | 9,263 |  |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  | 0 |  |
TOTAL ASSETS | 622,417 | 600,441 |  |
Accounts payable | 24,534 | 24,921 |  |
Accrued liabilities and other | 19,262 | 13,664 |  |
Debt | 9,215 | 6,516 |  |
Royalty obligations | 0 | 4,995 |  |
Reclamation | 2,313 | 2,672 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 0 | 0 |  |
Liabilities, Current | 55,324 | 52,768 |  |
Debt | 28,313 | 15,214 |  |
Royalty obligations |  | 4,292 |  |
Reclamation | 82,021 | 75,183 |  |
Deferred tax liabilities | 5,127 | 6,179 |  |
Other long-term liabilities | 3,063 | 4,750 |  |
Intercompany Payable Receivable | 317,759 | 336,813 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 |  |
Non-current liabilities | 436,283 | 442,431 |  |
Common stock, par value $0.01 per share; authorized 300,000,000 shares, issued and outstanding 185,637,724 at December 31, 2017 and 180,933,287 at December 31, 2016 | 19,630 | 250 |  |
Additional paid-in capital | 149,194 | 181,009 |  |
Accumulated deficit | (34,551) | (73,529) |  |
Accumulated other comprehensive income (loss) | (3,463) | (2,488) |  |
Stockholders' equity | 130,810 | 105,242 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 622,417 | 600,441 |  |
Non-Guarantor Subsidiaries |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 95,131 | 10,241 |  |
Receivables | 11,010 | 46,538 |  |
Ore on leach pads | 0 | 0 |  |
Inventory, Net | 28,461 | 44,043 |  |
Prepaid expenses and other | 4,413 | 4,753 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 91,421 | 71,442 |  |
Current assets | 230,436 | 177,017 |  |
Property, plant and equipment, net | 89,243 | 50,316 |  |
Mining properties, net | 613,288 | 354,499 |  |
Ore on leach pads | 0 | 0 |  |
Restricted assets | 7,369 | 7,201 |  |
Equity and debt securities | 0 | 0 |  |
Receivables | 28,750 | 13,745 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | (18) | 0 |  |
Other Assets, Noncurrent | 2,854 | 3,500 |  |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  | 48,763 |  |
TOTAL ASSETS | 971,922 | 655,041 |  |
Accounts payable | 20,451 | 17,586 |  |
Accrued liabilities and other | 62,463 | 9,900 |  |
Debt | 21,538 | 5,439 |  |
Royalty obligations | 0 | 0 |  |
Reclamation | 1,464 | 437 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 50,677 | 15,470 |  |
Liabilities, Current | 156,593 | 48,832 |  |
Debt | 323,912 | 229,036 |  |
Royalty obligations |  | 0 |  |
Reclamation | 35,034 | 10,409 |  |
Deferred tax liabilities | 95,911 | 49,822 |  |
Other long-term liabilities | 49,323 | 34,911 |  |
Intercompany Payable Receivable | 19,680 | 68,810 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 33,757 |  |
Non-current liabilities | 523,860 | 426,745 |  |
Common stock, par value $0.01 per share; authorized 300,000,000 shares, issued and outstanding 185,637,724 at December 31, 2017 and 180,933,287 at December 31, 2016 | 195,020 | 197,913 |  |
Additional paid-in capital | 1,885,046 | 1,864,261 |  |
Accumulated deficit | (1,788,597) | (1,882,710) |  |
Accumulated other comprehensive income (loss) | 0 | 0 |  |
Stockholders' equity | 291,469 | 179,464 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 971,922 | 655,041 |  |
Eliminations |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Receivables | 0 | 0 |  |
Ore on leach pads | 0 | 0 |  |
Inventory, Net | 0 | 0 |  |
Prepaid expenses and other | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 0 |  |
Current assets | 0 | 0 |  |
Property, plant and equipment, net | 0 | 0 |  |
Mining properties, net | 0 | 0 |  |
Ore on leach pads | 0 | 0 |  |
Restricted assets | 0 | 0 |  |
Equity and debt securities | 0 | 0 |  |
Receivables | 0 | 0 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | (422,279) | (284,706) |  |
Other Assets, Noncurrent | (316,744) | (221,559) |  |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  | 0 |  |
TOTAL ASSETS | (739,023) | (506,265) |  |
Accounts payable | 0 | 0 |  |
Accrued liabilities and other | 0 | 0 |  |
Debt | 0 | 0 |  |
Royalty obligations | 0 | 0 |  |
Reclamation | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 0 | 0 |  |
Liabilities, Current | 0 | 0 |  |
Debt | (316,744) | (221,559) |  |
Royalty obligations |  | 0 |  |
Reclamation | 0 | 0 |  |
Deferred tax liabilities | 0 | 0 |  |
Other long-term liabilities | 0 | 0 |  |
Intercompany Payable Receivable | 0 | 0 |  |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 |  |
Non-current liabilities | (316,744) | (221,559) |  |
Common stock, par value $0.01 per share; authorized 300,000,000 shares, issued and outstanding 185,637,724 at December 31, 2017 and 180,933,287 at December 31, 2016 | (214,650) | (198,163) |  |
Additional paid-in capital | (2,034,240) | (2,045,270) |  |
Accumulated deficit | 1,823,148 | 1,956,239 |  |
Accumulated other comprehensive income (loss) | 3,463 | 2,488 |  |
Stockholders' equity | (422,279) | (284,706) |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ (739,023) | $ (506,265) |  |

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