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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets |  |  | $ 10,264 | $ 6,838
Net deferred tax liabilities |  |  | (38,921) | (31,712)
Net deferred tax liabilities | $ (24,874) | $ (24,685) | (28,657) | (24,874)
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |  |
Begining balance | 24,874 | 24,685 |  |
Deferred income tax expense through income statement | 3,783 | 189 |  |
Ending balance | $ 28,657 | $ 24,874 |  |
Other temporary differences [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets |  |  | 6,268 | 2,898
Net deferred tax liabilities |  |  | (474) | (8,155)
Provision for decommissioning, restoration and rehabilitation costs [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets |  |  | 3,996 | 3,940
Mineral Properties [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax liabilities |  |  | (30,413) | (14,858)
Mining Taxes [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax liabilities |  |  | (3,376) | (3,336)
Equipment and Building [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax liabilities |  |  | $ (4,658) | $ (5,363)

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