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Income Taxes (Narratives) (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2019 | Apr. 30, 2019
Provisions [Line Items] |  |  |  |
Corresponding increase in tax expense | $ 7,673,000 | $ 4,247,000 |  |
Letters of credit oustanding | 1,593,379,000 | 1,573,873,000 |  |
Income taxes refunded | $ 1,521,000 | (9,583,000) |  |
Canadian Revenue Agency [member] |  |  |  |
Provisions [Line Items] |  |  |  |
Percentage of taxes and interest charges | 50.00% |  |  |
Provision for CRA transfer price dispute | $ 11,000,000 |  |  |
Income taxes refunded |  | 5,500,000 |  |
Legal proceeding legal fee recovery |  |  | $ 10,300,000 |
Legal proceeding other disbursements recovery |  | $ 12,200,000 |  |
Estimated amount of legal fees recoverable |  |  |  | $ 16,700,000

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