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Commitments (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019 $ 6,003  
2020 6,091  
2021 6,091  
2022 5,098  
2023 and thereafter 12,382  
Total future minimum lease payments for operating leases 35,665  
Operating leases, rent expense $ 2,277 $ 2,902