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Financial instruments (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 $ / $ | Dec. 31, 2018 $ / $ | Dec. 31, 2018 USD ($) $ / $ | Dec. 31, 2018 $ / $ $ / $ | Dec. 31, 2018 | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 $ / $ | Dec. 31, 2017 $ / $ | Dec. 31, 2017 $ / $
Currency risk |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Exposure to risk holding Canadian denominated cash and cash equivalents, percentage (up to) |  | 100.00% |  |  |  |  |  |  |  |
Exposure to risk holding Canadian dollar net expenditures, percentage (up to) |  | 50.00% |  |  |  |  |  |  |  |
Average price of hedging instrument (CDN per USD) | $ / $ | 1.30 | 1.30 | 1.30 | 1.30 |  |  |  |  |  |
January 1, 2018 Opening rate |  |  |  |  |  |  |  |  | 1.254 | 0.798
December 31, 2018 Closing rate | 1.363 | 1.363 | 1.363 | 1.363 |  |  |  | 0.734 |  |
Fiscal 2018 Average rate | 1.296 |  |  | 0.772 |  |  |  |  |  |
Increase in the corresponding risk variable on income |  |  | $ 2,633,000 |  |  |  |  |  |  |
Reasonably possible change in risk variable, percent |  |  |  |  | 10.00% |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Reasonably possible change in risk variable, percent |  |  |  |  | 0.25% |  |  |  |  |
Decrease in the corresponding risk variable on investment income |  |  |  |  |  | $ 481,000 |  |  |  |
Cash and cash equivalents | Currency risk |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Risk exposure associated with instruments sharing characteristic |  |  |  |  |  |  | $ 18,490 |  |  |
Foreign exchange contracts | Currency risk |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Risk exposure associated with instruments sharing characteristic |  |  |  |  |  |  | $ 17,400 |  |  |
Forward platinum contract | Commodity risk |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  | $ 0 |  |  |  |

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