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Shareholders' equity - Stock-based payments - Assumptions & Options (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
EquityInstruments
Y
CAD / shares
shares
Dec. 31, 2017
USD ($)
EquityInstruments
Y
shares
Dec. 31, 2016
USD ($)
EquityInstruments
Y
CAD / shares
Dec. 31, 2016
USD ($)
EquityInstruments
Y
Stock-based payments        
Aggregate number of common shares | shares 5,700,876 5,700,876    
Risk-free interest rate   1.65%   0.66%
Expected dividend yield   1.19%   1.54%
Expected price volatility of the Company's common shares   36.10%   37.70%
Expected life of the option | Y   5   5
Forfeiture rate   0.00%   0.00%
Weighted average life | Y 7.46 7.46    
Stock options outstanding, beginning of year (in shares) | EquityInstruments   1,304,328   1,592,480
Granted (in shares) | EquityInstruments   97,789   263,568
Exercised (in shares) | EquityInstruments   (433,718)   (545,087)
Forfeited (in shares) | EquityInstruments   (12,796)   (6,633)
Stock options outstanding, end of the year (in shares) | EquityInstruments   955,603   1,304,328
Exercisable stock options, end of the year (in shares) | EquityInstruments 617,539 617,539 825,875 825,875
Stock options outstanding, beginning of year (in dollars per share)   $ 50.64   $ 46.67
Granted (in dollars per share)   100.10   75.45
Exercised (in dollars per share)   30.79   39.25
Forfeited (in dollars per share)   67.81   58.35
Stock options outstanding, end of the year (in dollars per share)   64.48   50.64
Exercisable stock options, end of the year (in dollars per share) $ 55.88 $ 55.88 $ 39.72 39.72
Stock options        
Stock-based payments        
Period to issue common shares to single insider participant under compensation plan   1 year    
Maximum percentage of common shares issued to single insider participant under compensation plan within one year 5.00% 5.00%    
Term of options   10 years    
Vesting period   3 years    
Average fair value of options granted   $ 2,300,000   4,300,000
Weighted average fair value per stock option (in dollars per share) | CAD / shares $ 30.30   $ 21.78  
Expenses related to stock options   3,100,000   2,300,000
Capitalized to royalty, stream and working interest, net $ 500,000 500,000 $ 300,000 300,000
Total unrecognized non-cash stock-based compensation expense $ 4,200,000 $ 4,200,000 $ 5,300,000 $ 5,300,000
Weighted average life | Y 1.4 1.4 1.4 1.4