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Supplemental Information - Employee Compensation Costs (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Employee Compensation [Line Items] |  |
Employee compensation costs | $ 31,867 | $ 46,646
Operating |  |
Disclosure Of Employee Compensation [Line Items] |  |
Employee compensation costs | 9,065 | 12,918
General and administrative |  |
Disclosure Of Employee Compensation [Line Items] |  |
Employee compensation costs | $ 22,802 | $ 33,728

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