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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | $ 131,179 | $ 165,180
Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 176
Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 134 | 180
Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 148 |
Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 130,897 |
Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 164,824
CANADA |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 114,466 | 122,853
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 | 114,466 |
CANADA | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 122,853
UNITED STATES |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 13,634 | 13,495
UNITED STATES | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 120
UNITED STATES | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 85 | 86
UNITED STATES | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 80 |
UNITED STATES | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 13,469 |
UNITED STATES | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 13,289
PERU |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 250 | 0
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 | 250 |
PERU | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
MEXICO |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 2,456 | 20,925
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 | 2,456 |
MEXICO | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 20,925
BARBADOS |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 116 | 103
BARBADOS | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 6
BARBADOS | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 4 | 4
BARBADOS | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 7 |
BARBADOS | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 105 |
BARBADOS | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 93
ARGENTINA |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 257 | 7,804
ARGENTINA | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 50
ARGENTINA | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 45 | 90
ARGENTINA | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 61 |
ARGENTINA | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | $ 151 |
ARGENTINA | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | $ 7,664

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