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Supplemental cash flow information - Financing activities (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | $ 3,371,862 |
Changes from financing cash flows: |  |
Dividends paid | (31,613) | $ (71,224)
Interest paid | (72,484) | (72,976)
Shares issued, stock option plan | 81 | 0
Repayment of long-term debt | (500,000) | 0
Total cash changes | (606,920) | (144,200)
Non-cash changes: |  |
Amortization of issue costs | 1,047 |
Dividends declared | 31,613 |
Interest expense | 61,780 |
Lease interest expense | 309 |
Shares issued, stock option plan | 16 |
Foreign exchange | (114) |
Total non-cash changes | 94,651 |
Ending balance | 2,862,497 | 3,371,862
Long-term borrowings [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 1,495,671 |
Changes from financing cash flows: |  |
Dividends paid | 0 |
Interest paid | 0 |
Shares issued, stock option plan | 0 |
Repayment of long-term debt | (500,000) |
Total cash changes | (500,000) |
Non-cash changes: |  |
Amortization of issue costs | 1,047 |
Dividends declared | 0 |
Interest expense | 0 |
Lease interest expense | 0 |
Shares issued, stock option plan | 0 |
Foreign exchange | 0 |
Total non-cash changes | 1,047 |
Ending balance | 996,718 | 1,495,671
Interest payable [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 13,539 |
Changes from financing cash flows: |  |
Dividends paid | 0 |
Interest paid | (72,484) |
Shares issued, stock option plan | 0 |
Repayment of long-term debt | 0 |
Total cash changes | (72,484) |
Non-cash changes: |  |
Amortization of issue costs | 0 |
Dividends declared | 0 |
Interest expense | 61,780 |
Lease interest expense | 309 |
Shares issued, stock option plan | 0 |
Foreign exchange | (114) |
Total non-cash changes | 61,975 |
Ending balance | 3,030 | 13,539
Dividends Payable [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 0 |
Changes from financing cash flows: |  |
Dividends paid | (31,613) |
Interest paid | 0 |
Shares issued, stock option plan | 0 |
Repayment of long-term debt | 0 |
Total cash changes | (31,613) |
Non-cash changes: |  |
Amortization of issue costs | 0 |
Dividends declared | 31,613 |
Interest expense | 0 |
Lease interest expense | 0 |
Shares issued, stock option plan | 0 |
Foreign exchange | 0 |
Total non-cash changes | 31,613 |
Ending balance | 0 | 0
Share capital [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 1,862,652 |
Changes from financing cash flows: |  |
Dividends paid | 0 |
Interest paid | 0 |
Shares issued, stock option plan | 81 |
Repayment of long-term debt | 0 |
Total cash changes | 81 |
Non-cash changes: |  |
Amortization of issue costs | 0 |
Dividends declared | 0 |
Interest expense | 0 |
Lease interest expense | 0 |
Shares issued, stock option plan | 16 |
Foreign exchange | 0 |
Total non-cash changes | 16 |
Ending balance | $ 1,862,749 | $ 1,862,652

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