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Shareholders' equity - Stock-based payments - Exercise price (Details) | Dec. 31, 2018 USD ($) EquityInstruments Y | Dec. 31, 2017 EquityInstruments | Dec. 31, 2017 USD ($) | Dec. 31, 2016 EquityInstruments
--- | --- | --- | --- | ---
Shareholders' equity |  |  |  |
Options outstanding | 1,015,409 | 955,603 | 955,603 | 1,304,328
Options exercisable | 710,064 | 617,539 |  |
Weighted average life | Y | 7.00 |  |  |
C$31.39 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 31.39 |  |  |
Options outstanding | 10,000 |  |  |
Options exercisable | 10,000 |  |  |
Weighted average life | Y | 1.39 |  |  |
C$31.45 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 31.45 |  |  |
Options outstanding | 38,000 |  |  |
Options exercisable | 38,000 |  |  |
Weighted average life | Y | 1.71 |  |  |
C$33.12 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 33.12 |  |  |
Options outstanding | 1,500 |  |  |
Options exercisable | 1,500 |  |  |
Weighted average life | Y | 1.90 |  |  |
C$33.20 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 33.20 |  |  |
Options outstanding | 1,000 |  |  |
Options exercisable | 1,000 |  |  |
Weighted average life | Y | 1.98 |  |  |
C$40.87 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 40.87 |  |  |
Options outstanding | 52,786 |  |  |
Options exercisable | 52,786 |  |  |
Weighted average life | Y | 4.94 |  |  |
C$42.43 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 42.43 |  |  |
Options outstanding | 3,000 |  |  |
Options exercisable | 3,000 |  |  |
Weighted average life | Y | 3.25 |  |  |
C$42.67 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 42.67 |  |  |
Options outstanding | 2,500 |  |  |
Options exercisable | 2,500 |  |  |
Weighted average life | Y | 2.92 |  |  |
C$46.17 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 46.17 |  |  |
Options outstanding | 100,000 |  |  |
Options exercisable | 100,000 |  |  |
Weighted average life | Y | 4.63 |  |  |
C$55.58 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 55.58 |  |  |
Options outstanding | 27,397 |  |  |
Options exercisable | 27,397 |  |  |
Weighted average life | Y | 3.95 |  |  |
C$58.67 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 58.67 |  |  |
Options outstanding | 65,000 |  |  |
Options exercisable | 65,000 |  |  |
Weighted average life | Y | 6.64 |  |  |
C$59.52 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 59.52 |  |  |
Options outstanding | 113,914 |  |  |
Options exercisable | 113,914 |  |  |
Weighted average life | Y | 5.95 |  |  |
C$65.76 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 65.76 |  |  |
Options outstanding | 91,635 |  |  |
Options exercisable | 91,635 |  |  |
Weighted average life | Y | 6.95 |  |  |
C$75.45 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 75.45 |  |  |
Options outstanding | 257,064 |  |  |
Options exercisable | 170,736 |  |  |
Weighted average life | Y | 7.95 |  |  |
C$88.76 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 88.76 |  |  |
Options outstanding | 47,732 |  |  |
Weighted average life | Y | 9.64 |  |  |
C$94.57 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 94.57 |  |  |
Options outstanding | 106,092 |  |  |
Weighted average life | Y | 9.95 |  |  |
C$100.10 |  |  |  |
Shareholders' equity |  |  |  |
Exercise price | $ | $ 100.10 |  |  |
Options outstanding | 97,789 |  |  |
Options exercisable | 32,596 |  |  |
Weighted average life | Y | 8.94 |  |  |

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