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Federal Income Taxes - Schedule of Components of Future Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 56,781 | $ 85,995
Mineral properties | 7,237 | 10,152
Accrued vacation | 17 | 29
Reclamation provision | 224 | 41
Capital loss carryforwards | 1,013 | 618
Restoration reserves | 980 | 1,623
Capitalized transaction costs | 912 | 1,140
Other | 4,123 | 4,072
Deferred tax assets | 71,287 | 103,670
Valuation allowance | (68,121) | (99,548)
Net deferred tax assets | 3,166 | 4,122
Derivatives | (590) | (956)
Mineral properties, Turkey | (1,437) | (1,489)
Securities | (106) |
Property, plant and equipment | (1,033) | (1,677)
Deferred tax liabilities | (3,166) | (4,122)
Net deferred tax asset (liability) |  |

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