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Federal Income Taxes - Schedule of Components of Future Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 85,995 | $ 80,491
Mineral properties | 11,608 | 13,970
Capital loss carryforwards | 618 | 618
Restoration reserves | 1,623 | 1,478
Capitalized transaction costs | 1,140 | 1,145
Other | 5,562 | 946
Deferred tax assets | 106,546 | 98,648
Valuation allowance | (101,523) | (96,203)
Net deferred tax assets | 5,023 | 2,445
Prepaids and other | 70 | 68
Deferred tax liabilities current | 70 | 68
Derivatives | (956) | (956)
Property, plant and equipment | (4,137) | (1,557)
Deferred tax liabilities | (5,093) | (2,513)
Net deferred tax asset (liability) |  |

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