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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
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