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v3.20.1

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | $ 39,739 | $ 17,248
Deferred tax liabilities |  |  | (60,654) | (48,692)
Net deferred tax liabilities |  |  | (20,915) | (31,444)
Net deferred tax liabilities | $ (20,915) | $ (31,444) | (20,915) | (31,444)
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |  |
Beginning balance | 31,444 | 28,657 |  |
Deferred income tax expense through income statement | (12,456) | 2,787 |  |
Deferred income tax expense through equity | 1,927 |  |  |
Ending balance | $ 20,915 | $ 31,444 |  |
Reclamation and closure cost obligation [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 9,530 | 4,594
Carried forward tax loss [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 14,020 | 3,386
Accounts payable and accrued liability [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 7,731 | 5,642
Deductibility of resource taxes [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 3,140 | 3,436
Lease obligations [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 5,317 |
Other deferred tax assets [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  |  | 1 | 190
Mineral Properties [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (44,825) | (34,541)
Mining and foreign withholding taxes [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (5,281) | (8,412)
Equipment and Building [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (3,621) | (4,413)
Convertible Debentures [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (1,857) |
Inflation [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | (4,939) |
Other deferred tax liabilities [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities |  |  | $ (131) | $ (1,326)

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