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Shares - Common shares (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance, outstanding (in shares) | 26,420,821 | 28,458,115
Retired through share purchase programs (in shares) |  | (2,195,646)
Purchase of treasury shares (in shares) | (20,955) | (26,012)
Settlement of certain equity classified stock-based compensation (in shares) | 337,229 | 184,364
Ending balance, outstanding (in shares) | 26,737,095 | 26,420,821
Shares to satisfy recipient tax withholding requirements (in shares) | 234,728,000 | 112,583,000
Satisfaction of recipient tax withholding | $ 5,479 | $ 1,591
Common shares |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance, outstanding (in shares) | 27,827,282 | 30,022,928
Retired through share purchase programs (in shares) |  | (2,195,646)
Purchase of treasury shares (in shares) | 0 | 0
Settlement of certain equity classified stock-based compensation (in shares) | 0 | 0
Ending balance, outstanding (in shares) | 27,827,282 | 27,827,282
Treasury shares |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance, outstanding (in shares) | (1,406,461) | (1,564,813)
Retired through share purchase programs (in shares) |  | 0
Purchase of treasury shares (in shares) | (20,955) | (26,012)
Settlement of certain equity classified stock-based compensation (in shares) | 337,229 | 184,364
Ending balance, outstanding (in shares) | (1,090,187) | (1,406,461)

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- Definition Stock Issued During Period, Shares, Treasury Stock Reissued to Satisfy Shared-based Compensation Obligations + References No definition available. + Details
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- Definition Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
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