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Income Taxes (Schedule of Tax Losses Expiry Dates) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [line items]
Unused tax losses for which no deferred tax asset recognised	$ 73,994	$ 55,500
CANADA
Income Taxes [line items]
Unused tax losses for which no deferred tax asset recognised	$ 74,300	55,500
CANADA | Bottom of range [member]
Income Taxes [line items]
Year of Expiry	2025
CANADA | Top of range [member]
Income Taxes [line items]
Year of Expiry	2037
ARGENTINA
Income Taxes [line items]
Unused tax losses for which no deferred tax asset recognised	$ 3,700
ARGENTINA | Bottom of range [member]
Income Taxes [line items]
Year of Expiry	2018
ARGENTINA | Top of range [member]
Income Taxes [line items]
Year of Expiry	2022
MEXICO
Income Taxes [line items]
Unused tax losses for which no deferred tax asset recognised	$ 332	450
MEXICO | Bottom of range [member]
Income Taxes [line items]
Year of Expiry	2021
MEXICO | Top of range [member]
Income Taxes [line items]
Year of Expiry	2025
BARBADOS
Income Taxes [line items]
Unused tax losses for which no deferred tax asset recognised	$ 266	$ 185
BARBADOS | Bottom of range [member]
Income Taxes [line items]
Year of Expiry	2022
BARBADOS | Top of range [member]
Income Taxes [line items]
Year of Expiry	2024

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Expiry year of tax loss carryforwards.

+ References

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Income Taxes [line items].

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X

- 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

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