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Supplemental cash flow information - Financing activities (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | $ 2,875,366 |
Changes from financing cash flows: |  |
Dividends paid | (31,638) | $ (31,613)
Interest paid | (65,547) | (72,484)
Lease principal payments | (3,716) | (2,904)
Shares issued, stock option plan | 5,375 | 81
Repayment of long-term debt | (400,000) | (500,000)
Proceeds of long-term debt | 397,539 | 0
Total cash changes | (97,987) | (606,920)
Non-cash changes: |  |
Amortization of issue costs | 1,284 |
Dividends declared | 31,638 |
Interest expense | 66,495 |
Right-of-use asset additions | 2,221 |
Right-of-use asset cancellations | (2,165) |
Joint operation lease obligations | (1,361) |
Shares issued, stock option plan | 1,586 |
Foreign exchange | 103 |
Total non-cash changes | 99,801 |
Ending balance | 2,877,180 | 2,875,366
Long-term borrowings [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 996,718 |
Changes from financing cash flows: |  |
Repayment of long-term debt | (400,000) |
Proceeds of long-term debt | 397,539 |
Total cash changes | (2,461) |
Non-cash changes: |  |
Amortization of issue costs | 1,284 |
Total non-cash changes | 1,284 |
Ending balance | 995,541 | 996,718
Interest payable [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 3,030 |
Changes from financing cash flows: |  |
Interest paid | (65,280) |
Total cash changes | (65,280) |
Non-cash changes: |  |
Interest expense | 66,228 |
Total non-cash changes | 66,228 |
Ending balance | 3,978 | 3,030
Lease obligation [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 12,869 |
Changes from financing cash flows: |  |
Interest paid | (267) |
Lease principal payments | (3,716) |
Total cash changes | (3,983) |
Non-cash changes: |  |
Interest expense | 267 |
Right-of-use asset additions | 2,221 |
Right-of-use asset cancellations | (2,165) |
Joint operation lease obligations | (1,361) |
Foreign exchange | 103 |
Total non-cash changes | (935) |
Ending balance | 7,951 | 12,869
Dividends Payable [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 0 |
Changes from financing cash flows: |  |
Dividends paid | (31,638) |
Total cash changes | (31,638) |
Non-cash changes: |  |
Dividends declared | 31,638 |
Total non-cash changes | 31,638 |
Ending balance | 0 | 0
Share capital [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 1,862,749 |
Changes from financing cash flows: |  |
Shares issued, stock option plan | 5,375 |
Total cash changes | 5,375 |
Non-cash changes: |  |
Shares issued, stock option plan | 1,586 |
Total non-cash changes | 1,586 |
Ending balance | $ 1,869,710 | $ 1,862,749

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