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Share-Based Compensation And Other Related Information - Options Outstanding and Exercisable (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2017 shares $ / shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 1,143,348 | 698,387 | 936,123
Weighted average remaining contractual life of outstanding share options | 1 year 10 months 28 days |  |
Weighted Average Exercise Price (CAD$ per share) | $ 33.84 | $ 15.00 | $ 16.56
Number Exercisable at Year End (shares) | shares | 1,045,982 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 35.16 |  |
$9.76 - $23.61 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 476,368 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 11 months 10 days |  |
Weighted Average Exercise Price (CAD$ per share) | $ 14.96 |  |
Number Exercisable at Year End (shares) | shares | 401,790 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 14.48 |  |
$9.76 - $23.61 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 9.76 |  |
$9.76 - $23.61 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 23.61 |  |
$23.62 - $35.21 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 150,614 |  |
Weighted average remaining contractual life of outstanding share options | 1 year 2 months 9 days |  |
Weighted Average Exercise Price (CAD$ per share) | $ 27.72 |  |
Number Exercisable at Year End (shares) | shares | 127,826 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 27.94 |  |
$23.62 - $35.21 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 23.62 |  |
$23.62 - $35.21 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 35.21 |  |
$35.22 - $46.53 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 179,488 |  |
Weighted average remaining contractual life of outstanding share options | 4 months 10 days |  |
Weighted Average Exercise Price (CAD$ per share) | $ 41.72 |  |
Number Exercisable at Year End (shares) | shares | 179,488 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 41.72 |  |
$35.22 - $46.53 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 35.22 |  |
$35.22 - $46.53 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 46.53 |  |
$46.54 - $54.15 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 189,106 |  |
Weighted average remaining contractual life of outstanding share options | 2 months 2 days |  |
Weighted Average Exercise Price (CAD$ per share) | $ 51.60 |  |
Number Exercisable at Year End (shares) | shares | 189,106 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 51.60 |  |
$46.54 - $54.15 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 46.54 |  |
$46.54 - $54.15 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 54.15 |  |
$54.16 - $97.26 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 147,772 |  |
Weighted average remaining contractual life of outstanding share options | 2 months 10 days |  |
Weighted Average Exercise Price (CAD$ per share) | $ 68.63 |  |
Number Exercisable at Year End (shares) | shares | 147,772 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 68.63 |  |
$54.16 - $97.26 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 54.16 |  |
$54.16 - $97.26 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 97.26 |  |

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