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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | $ (168,549) | $ (169,136)
Tax benefit related to tax losses | 6,487 | 7,861
Closure and decommissioning costs |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | 7,019 | 7,133
Tax losses and mining tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | 24,014 | 26,646
Deductible Mexican mining taxes |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | 2,792 | 2,344
Tax credit resulting from Mexican de-consolidation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | 1,385 | 4,790
Accounts payable and accrued liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | 3,047 | 2,373
Trade and other receivables |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | 21,527 | 10,526
Provision for doubtful debts and inventory adjustments |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | (14,517) | (16,261)
Mineral properties, plant, and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | (186,641) | (192,046)
Estimated sales provisions |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | (28,726) | (14,907)
Other temporary differences and provisions |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | 1,551 | 266
Unused tax losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets and liabilities | 80,600 | 89,000
Net deferred tax liability |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax benefit related to tax losses | $ 24,000 | $ 26,600

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