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Income taxes - Expense (benefit) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Income before income taxes | $ 39,991 | $ 21,417
Tax rate | 26.50% | 27.00%
Expected expense | $ 10,598 | $ 5,783
(Decrease) increase related to: |  |
Impact of enacted future statutory income tax rates | (5,797) | 0
Rate differential on equity earnings in affiliates and joint ventures | (859) | 0
Other | (1,097) | 313
Deferred income tax expense | 2,845 | 6,096
Current income tax expense | 13 | 0
Total income tax expense | $ 2,858 | $ 6,096

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