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Related party transactions - Disclosure of detailed information about reduction of general and administrative expenses and business development expenses (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Amounts invoiced to associates as a reduction of:    
General and administrative expenses $ 23,682 $ 18,156
Business development expenses 6,122 4,525
Associates [Member]    
Amounts invoiced to associates as a reduction of:    
General and administrative expenses 973 1,409
Business development expenses 2,371 3,749
Total amounts invoiced to associates $ 3,344 $ 5,158