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Post-employment benefit obligations (Amounts Recognized In Consolidated Statements of Loss and Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of defined benefit plans [abstract] |  |
Current service costs and interest costs included in cost of sales | $ 1,773 | $ 1,838

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- Definition Current service costs and interest costs included in cost of sales. + References No definition available. + Details
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Balance Type: | debit
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