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Share-Based Compensation And Other Related Information - Option Activity (Details) | 12 Months Ended
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Dec. 31, 2020 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2019 shares $ / shares
Disclosure of share-based payment arrangements [Abstract] |  |  |  |
Share options outstanding, beginning (shares) | 1,143,348 | 1,143,348 | 698,387 | 698,387
Granted (shares) |  |  | 22,788 | 22,788
Granted (shares) | 7,605 | 7,605 |  |
Granted pursuant to the Tahoe Acquisition (shares) |  |  | 835,874 | 835,874
Exercised (shares) | (329,711) | (329,711) | (244,299) | (244,299)
Expired (shares) | (482,438) | (482,438) | (141,604) | (141,604)
Forfeited (shares) | (21,387) | (21,387) | (27,798) | (27,798)
Share options outstanding, ending (shares) | 317,417 | 317,417 | 1,143,348 | 1,143,348
Outstanding, beginning of period (CAD$ per share) | $ / shares | $ 33.84 |  | $ 15.00 |
Granted (CAD$ per share) | (per share) |  | $ 39.45 | 26.54 | $ 26.54
Granted (CAD$ per share) | $ / shares | 39.48 |  |  |
Granted pursuant to the Tahoe Acquisition (CAD$ per share) | $ / shares |  |  | 48.47 |
Exercised (CAD$ per share) | $ / shares | 19.23 |  | 15.10 |
Expired (CAD$ per share) | $ / shares | 53.41 |  | 58.45 |
Forfeited (CAD$ per share) | $ / shares | 43.08 |  | 34.00 |
Outstanding, end of period (CAD$ per share) | $ / shares | $ 18.78 |  | $ 33.84 |

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