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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | $ 117,461 | $ 140,361
Closure and decommissioning costs |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | (26,482) | (16,002)
Tax losses, resource pools and mining tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | (140,608) | (122,187)
Deductible Mexican mining taxes |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | (3,286) | (2,701)
Accounts payable and accrued liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | (17,737) | (17,974)
Trade and other receivables |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | (13,290) | (17,194)
Provision for doubtful debts and inventory adjustments |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | 21,354 | 7,145
Short-term investments |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | 15,649 | 15,295
Mineral properties, plant, and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | 274,483 | 278,707
Estimated sales provisions |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | 14,028 | 23,026
Other temporary differences and provisions |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | (6,650) | (7,754)
Unused tax losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | (43,800) | (59,600)
Resource pools |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets/liabilities | $ (96,800) | $ (62,600)

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