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Income Taxes (Schedule of Tax Losses Expiry Dates) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 81,188 | $ 73,994
CANADA |  |
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 81,000 | $ 74,300
CANADA | Bottom of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2026 | 2026
CANADA | Top of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2038 | 2037
ARGENTINA |  |
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 11,900 | $ 3,700
ARGENTINA | Bottom of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2019 | 2018
ARGENTINA | Top of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2023 | 2022
MEXICO |  |
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 349 | $ 332
MEXICO | Bottom of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2021 | 2021
MEXICO | Top of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2026 | 2025
PERU |  |
Income Taxes [line items] |  |
Year of Expiry | 2021 | 2021
Unused tax losses for which no deferred tax asset recognised | $ 238 | $ 265

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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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