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Segmented Financial Information - Assets By Segment (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of operating segments [line items] |  |
Assets | $ 3,408,096 | $ 5,914,083
Operating segments | Canada |  |
Disclosure of operating segments [line items] |  |
Assets | 1,646,412 | 3,484,123
Operating segments | U.S. |  |
Disclosure of operating segments [line items] |  |
Assets | 1,737,533 | 2,403,310
Operating segments | Corporate |  |
Disclosure of operating segments [line items] |  |
Assets | $ 24,151 | $ 26,650

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