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Investments in affiliates and joint ventures - Balance Sheets (Details) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets    
Current assets $ 9,769 $ 0
Non-current assets 2,392 0
Total assets 12,161 0
Liabilities    
Current liabilities 4,013 0
Non-current liabilities 3,032 0
Total liabilities $ 7,045 $ 0