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Financial risk management (Schedule of Currency Risks) (Details) - Currency risk [Member] $ in Thousands, $ in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) $ / $ $ / $ | Sep. 30, 2018 MXN ($) | Sep. 30, 2018 USD ($) $ / $ $ / $ | Sep. 30, 2018 CAD ($) | Sep. 30, 2018 MXN ($) | Sep. 30, 2018 CAD ($) $ / $ $ / $ | Sep. 30, 2018 MXN ($) $ / $ $ / $
Canadian Dollar [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Approximate impact of exchange rate fluctuations on net loss |  |  |  | $ 523 |  |  |
Approximate impact of exchange rate fluctuations on other comprehensive loss |  |  |  | $ 39 |  |  |
Foreign exchange rates | $ / $ | 1.29 |  | 1.29 |  |  | 1.29 | 1.29
Mexican Peso [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Approximate impact of exchange rate fluctuations on net loss |  |  |  |  | $ 1,331 |  |
Approximate impact of exchange rate fluctuations on other comprehensive loss |  |  |  |  | (57) |  |
Foreign exchange rates | $ / $ | 18.81 |  | 18.81 |  |  | 18.81 | 18.81
Cash and Cash Equivalents [Member] | Canadian Dollar [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income |  |  |  |  |  | $ 206 |
Cash and Cash Equivalents [Member] | Mexican Peso [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income |  |  |  |  |  |  | $ 133
Trade and other receivables [Member] | Canadian Dollar [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income |  |  |  |  |  | 39 |
Trade and other receivables [Member] | Mexican Peso [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income |  |  |  |  |  |  | 1,871
Trade and Other Payables [Member] | Canadian Dollar [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income |  |  |  |  |  | $ 1,004 |
Trade and Other Payables [Member] | Mexican Peso [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income |  |  |  |  |  |  | 4,506
Non-Hedge Foreign Exchange Forward Contracts [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Realized gains on forward exchange contracts | $ 100 |  | $ 200 |  |  |  |
Non-Hedge Foreign Exchange Forward Contracts [Member] | Mexican Peso [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income |  |  |  |  |  |  | $ 33,700
Risk from currency fluctuations recognized in net earnings or other comprehensive income |  | $ 44,100 |  |  | $ 68,900 |  |
Foreign exchange rates | $ / $ | 21.00 |  | 21.00 |  |  | 21.00 | 21.00
Approximate value of currency expected to be settled in fourth quarter | $ 1,600 |  | $ 1,600 |  |  |  |
Approximate value of currency expected to be settled in fourth quarter, portion held as fund deposit | 100 |  | 100 |  |  |  |
Realized gains on forward exchange contracts | $ 200 |  | $ 100 |  |  |  |
Foreign Exchange Forward Contracts [Member] | Mexican Peso [Member] |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income |  |  |  |  |  |  | $ 1,800
Foreign exchange rates | $ / $ | 18.85 |  | 18.85 |  |  | 18.85 | 18.85

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