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Related parties (Details)
 12 Months Ended
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of transactions between related parties [line items]            
Short-term employee benefits $ 21,225,000   $ 24,821,000      
Share-based compensation 12,034,000   12,796,000      
Post-employment benefits 5,542,000   4,323,000      
Termination benefits 272,000   860,000      
Total compensation 39,073,000   42,800,000      
Dividends from equity-accounted investee $ 14,079,000   0      
Key management personnel of entity or parent [member]            
Disclosure of transactions between related parties [line items]            
Description of any retirement benefit plan termination terms Upon resignation at the Company’s request, they are entitled to termination benefits of up to the lesser of 18 to 24 months or the period remaining until age 65. The termination benefits include gross salary plus the target short-term incentive bonus for the year in which termination occurs Upon resignation at the Company’s request, they are entitled to termination benefits of up to the lesser of 18 to 24 months or the period remaining until age 65. The termination benefits include gross salary plus the target short-term incentive bonus for the year in which termination occurs        
Inkai [Member]            
Disclosure of transactions between related parties [line items]            
Loan facilities         $ 175,000,000  
Interest rate basis LIBOR plus 2% LIBOR plus 2%        
Interest income $ 1,878,000   5,603,000      
Loan oustanding 0   124,533,000   $ 0 $ 91,320,000
Purchases 112,861,000 $ 84,827,000 94,063,000 $ 72,007,000    
Dividends from equity-accounted investee $ 14,079,000 $ 10,635,000 $ 0 $ 0