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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities $ (136,575) $ (168,549)
Tax benefit related to tax losses 3,600 6,487
Closure and decommissioning costs    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities 9,105 7,019
Tax losses and mining tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities 29,195 24,014
Deductible Mexican mining taxes    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities 2,974 2,792
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 698 1,385
Accounts payable and accrued liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities 6,726 3,047
Trade and other receivables    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities 15,756 21,527
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 (11,752) (14,517)
Mineral properties, plant, and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities (169,703) (186,641)
Estimated sales provisions    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities (19,746) (28,726)
Other temporary differences and provisions    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities 172 1,551
Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets and liabilities $ 98,400 $ 80,600