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Income Taxes - Deductible Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 316,409 $ 347,629
Tax loss (revenue in nature)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 131,179 165,180
Net tax loss (capital in nature)    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 14,456 15,423
Resource pools and other tax credits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 18,266 18,609
Financing fees    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 785 1,464
Mineral properties, plant, and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 22,669 20,441
Closure and decommissioning costs    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 33,835 42,484
Exploration and other expenses not currently deductible    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 51,175 54,672
Intercompany debt    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 10,160 8,061
Doubtful debt and inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 24,840 16,602
Deductible Mexican mining taxes    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 0 77
Payroll and vacation accruals    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences 827 2,015
Other temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deductible temporary differences $ 8,217 $ 2,601