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Financial instruments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
$ / $
Dec. 31, 2018
$ / $
Dec. 31, 2018
USD ($)
$ / $
Dec. 31, 2018
$ / $
$ / $
Dec. 31, 2018
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
$ / $
Dec. 31, 2017
$ / $
Dec. 31, 2017
$ / $
Currency risk                    
Disclosure of nature and extent of risks arising from financial instruments [line items]                    
Exposure to risk holding Canadian denominated cash and cash equivalents, percentage (up to)   100.00%                
Exposure to risk holding Canadian dollar net expenditures, percentage (up to)   50.00%                
Average price of hedging instrument (CDN per USD) | $ / $ 1.30 1.30 1.30 1.30            
January 1, 2018 Opening rate                 1.254 0.798
December 31, 2018 Closing rate 1.363 1.363 1.363 1.363       0.734    
Fiscal 2018 Average rate 1.296     0.772            
Increase in the corresponding risk variable on income     $ 2,633,000              
Reasonably possible change in risk variable, percent         10.00%          
Interest rate risk                    
Disclosure of nature and extent of risks arising from financial instruments [line items]                    
Reasonably possible change in risk variable, percent         0.25%          
Decrease in the corresponding risk variable on investment income           $ 481,000        
Cash and cash equivalents | Currency risk                    
Disclosure of nature and extent of risks arising from financial instruments [line items]                    
Risk exposure associated with instruments sharing characteristic             $ 18,490      
Foreign exchange contracts | Currency risk                    
Disclosure of nature and extent of risks arising from financial instruments [line items]                    
Risk exposure associated with instruments sharing characteristic             $ 17,400      
Forward platinum contract | Commodity risk                    
Disclosure of nature and extent of risks arising from financial instruments [line items]                    
Financial assets           $ 0