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Mineral Properties and Exploration and Evaluation Assets (Northwest Nevada Initiative Property) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance, January 1 | $ 130,863 |
Less: write-off | 202 | $ 1,143
Balance, December 31 | 133,664 | 130,863
Northwest Nevada Initiative [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance, January 1 | 200 |
Additions | 1,410 |
Subtotal carrying amount of property after expenditures | 1,610 |
Less: charged to exploration expenses | (1,301) |
Less: transferred to accounts receivable | (109) |
Decreases to property | 200 |
Less: write-off | (200) |
Balance, December 31 |  | $ 200

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