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Income taxes (Components of Deferred Income Taxes not Recognized in Repect to Deductible Temporary Differences) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Total deferred income taxes not recognized from temporary differences and unused tax losses as future utilization is not considered probable | $ 140,804 | $ 141,558
Temporary Differences - Property, Plant and Equipment [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income taxes not recognized from temporary differences as future utilization is not considered probable | 4,890 | 3,272
Mexican Tax Losses (expiring in 2018 - 2027) [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income taxes not recognized from tax losses as future utilization is not considered probable | 42,843 | 52,702
Canadien Tax Losses (expiring in 2029 - 2037) [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income taxes not recognized from tax losses as future utilization is not considered probable | 35,173 | 30,268
U.S. Tax Losses (expiring in 2020 - 2037) [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income taxes not recognized from tax losses as future utilization is not considered probable | 32,070 | 29,764
Provisions and Other [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income taxes not recognized from temporary differences as future utilization is not considered probable | 24,956 | 24,718
Deferred Mexican Mining Royalty [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred income taxes not recognized from temporary differences as future utilization is not considered probable | $ 872 | $ 834

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Total deferred income taxes not recognized from temporary differences and unused tax losses as future utilization is not considered probable. + References No definition available. + Details
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