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Income Taxes (Schedule of Income Tax Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [abstract] |  |
Net income before tax | $ 104,951 | $ 47,110
Statutory tax rate | 26.00% | 26.00%
Anticipated income tax at statutory rates | $ 27,287 | $ 12,249
Non-deductible expenditures | 1,082 | 514
Differences between Canadian and foreign tax rates | 5,804 | 2,995
Change in estimate | 88 | (511)
Effect of change in tax rates | (1,576) | (622)
Inflation adjustment | (2,242) | (933)
Impact of foreign exchange | (666) | 5,328
Change in deferred tax assets | 4,194 | 4,839
Mining taxes | 4,568 | 2,738
Withholding taxes | 649 | 2,760
Other items | (542) | (105)
Total tax expense | 38,646 | 29,252
Current income tax expense | 34,863 | 29,063
Deferred income tax expense | $ 3,783 | $ 189

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- Definition The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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