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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | $ 165,180 | $ 171,077
Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 5
Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 176 | 133
Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 180 |
Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 164,824 |
Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 170,939
CANADA |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 122,853 | 116,009
CANADA | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
CANADA | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 | 0
CANADA | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
CANADA | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 122,853 |
CANADA | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 116,009
UNITED STATES |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 13,495 | 13,762
UNITED STATES | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
UNITED STATES | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 120 | 120
UNITED STATES | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 86 |
UNITED STATES | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 13,289 |
UNITED STATES | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 13,642
PERU |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 | 39,057
PERU | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
PERU | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 | 0
PERU | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
PERU | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
PERU | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 39,057
MEXICO |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 20,925 | 2,160
MEXICO | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
MEXICO | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 | 0
MEXICO | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
MEXICO | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 20,925 |
MEXICO | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 2,160
BARBADOS |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 103 | 58
BARBADOS | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 5
BARBADOS | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 6 | 6
BARBADOS | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 4 |
BARBADOS | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 93 |
BARBADOS | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 47
ARGENTINA |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 7,804 | 31
ARGENTINA | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
ARGENTINA | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 50 | 7
ARGENTINA | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 90 |
ARGENTINA | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | $ 7,664 |
ARGENTINA | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | $ 24

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