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Share-Based Compensation And Other Related Information - Option Activity (Details) | 12 Months Ended
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Dec. 31, 2019 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2018 shares $ / shares
Disclosure of share-based payment arrangements [Abstract] |  |  |  |
Share options outstanding, beginning (shares) | 698,387 | 698,387 | 936,123 | 936,123
Granted (shares) |  |  | 149,163 | 149,163
Granted (shares) | 22,788 | 22,788 |  |
Granted pursuant to the Tahoe Acquisition (shares) | 835,874 | 835,874 |  |
Exercised (shares) | (244,299) | (244,299) | (125,762) | (125,762)
Expired (shares) | (141,604) | (141,604) | (211,614) | (211,614)
Forfeited (shares) | (27,798) | (27,798) | (49,523) | (49,523)
Share options outstanding, ending (shares) | 1,143,348 | 1,143,348 | 698,387 | 698,387
Outstanding, beginning of period (CAD$ per share) | $ / shares | $ 15.00 |  | $ 16.56 |
Granted (CAD$ per share) | (per share) |  | $ 26.54 | 17.53 | $ 17.53
Granted (CAD$ per share) | $ / shares | 26.54 |  |  |
Granted pursuant to the Tahoe Acquisition (CAD$ per share) | $ / shares | 48.47 |  |  |
Exercised (CAD$ per share) | $ / shares | 15.10 |  | 11.14 |
Expired (CAD$ per share) | $ / shares | 58.45 |  | 24.90 |
Forfeited (CAD$ per share) | $ / shares | 34.00 |  | 19.49 |
Outstanding, end of period (CAD$ per share) | $ / shares | $ 33.84 |  | $ 15.00 |

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