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Note 6 - Income Taxes - Components of the Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Accrued reclamation costs | $ 29,064 | $ 21,812 |  |
Deferred exploration | 16,500 | 17,426 |  |
Foreign net operating losses | 13,231 | 1,003 |  |
Domestic net operating losses | 152,320 | 130,186 |  |
AMT credit carryforwards |  | 584 |  |
Pension and benefit obligation | 12,345 | 12,584 |  |
Foreign exchange loss | 24,849 | 18,112 |  |
Foreign tax credit carryforward | 4,149 | 4,983 |  |
Miscellaneous | 26,290 | 25,411 |  |
Total deferred tax assets | 278,748 | 232,101 |  |
Valuation allowance | (94,981) | (78,684) | $ (99,602) | $ (115,806)
Total deferred tax assets | 183,767 | 153,417 |  |
Miscellaneous | (5,234) | (4,978) |  |
Properties, plants and equipment | (350,083) | (271,282) |  |
Total deferred tax liabilities | (355,317) | (276,260) |  |
Net deferred tax liability | $ (171,550) | $ (122,843) |  |

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