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Income Taxes (Schedule of Unrecognized Deductible Temporary Difference and Unused Tax Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Taxes [line items] |  |
Non capital losses | $ 81,188 | $ 73,994
Provision | 5,173 | 11,720
Share issue costs | 3,354 | 4,473
Mineral properties, plant and equipment | 244 | 762
Capital losses | 2,326 | 906
Unrecognized deductible temporary differences | 92,285 | 91,855
MEXICO |  |
Income Taxes [line items] |  |
Non capital losses | 349 | 332
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised | 97,705 | 69,044
PERU |  |
Income Taxes [line items] |  |
Non capital losses | 238 | 265
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised | $ 69,669 | $ 98,070

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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [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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