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Share capital (Schedule of Stock Options Outstanding and Exercisable) (Details)
shares in Thousands
Sep. 30, 2018
CAD ($)
shares
yr
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Outstanding | shares 3,120 2,316 1,771
Weighted average exercise price $ 3.79 $ 3.06 $ 4.64
Exercisable | shares 1,849    
Weighted average exercise price $ 3.37    
CAD 2.00 to 3.00 [Member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighted average remaining contractual life (years) | yr 0.40    
Outstanding | shares 691    
Weighted average exercise price $ 2.04    
Exercisable | shares 691    
Weighted average exercise price $ 2.04    
CAD 2.00 to 3.00 [Member] | Bottom of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price 2    
CAD 2.00 to 3.00 [Member] | Top of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 3    
CAD 3.01 to 4.00 [Member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighted average remaining contractual life (years) | yr 1.32    
Outstanding | shares 1,025    
Weighted average exercise price $ 3.85    
Exercisable | shares 683    
Weighted average exercise price $ 3.85    
CAD 3.01 to 4.00 [Member] | Bottom of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price 3.01    
CAD 3.01 to 4.00 [Member] | Top of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 4    
CAD 4.01 to 5.00 [Member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighted average remaining contractual life (years) | yr 2.26    
Outstanding | shares 1,364    
Weighted average exercise price $ 4.58    
Exercisable | shares 462    
Weighted average exercise price $ 4.58    
CAD 4.01 to 5.00 [Member] | Bottom of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price 4.01    
CAD 4.01 to 5.00 [Member] | Top of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 5    
CAD 5.01 to 6.00 [Member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Weighted average remaining contractual life (years) | yr 2.32    
Outstanding | shares 40    
Weighted average exercise price $ 5.55    
Exercisable | shares 13    
Weighted average exercise price $ 5.55    
CAD 5.01 to 6.00 [Member] | Bottom of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price 5.01    
CAD 5.01 to 6.00 [Member] | Top of range [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 6