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Financial instruments and risk management - Assets held-for-sale (Details) - Non-recurring basis - Level 3 - CAD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held for sale | $ 672 | $ 5,642
Change in Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held for sale | $ (1,278) | $ (72)

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