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Supplemental cash flow information - Financing activities (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | $ 3,411,672 |
Changes from financing cash flows: |  |
Dividends paid | (71,224) | $ (158,297)
Interest paid | (72,976) | (69,498)
Shares issued, stock option plan |  | 4
Total cash changes | (144,200) | (227,791)
Non-cash changes: |  |
Amortization of issue costs | 1,200 |
Dividends declared | 31,645 |
Interest expense | 71,839 |
Foreign exchange | (294) |
Total non-cash changes | 104,390 |
Ending balance | 3,371,862 | 3,411,672
Long-term borrowings [member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 1,494,471 |
Changes from financing cash flows: |  |
Dividends paid | 0 |
Interest paid | 0 |
Total cash changes | 0 |
Non-cash changes: |  |
Amortization of issue costs | 1,200 |
Dividends declared | 0 |
Interest expense | 0 |
Foreign exchange | 0 |
Total non-cash changes | 1,200 |
Ending balance | 1,495,671 | 1,494,471
Interest payable [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 14,970 |
Changes from financing cash flows: |  |
Dividends paid | 0 |
Interest paid | (72,976) |
Total cash changes | (72,976) |
Non-cash changes: |  |
Amortization of issue costs | 0 |
Dividends declared | 0 |
Interest expense | 71,839 |
Foreign exchange | (294) |
Total non-cash changes | 71,545 |
Ending balance | 13,539 | 14,970
Dividends Payable [Member] |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Beginning balance | 39,579 |
Changes from financing cash flows: |  |
Dividends paid | (71,224) |
Interest paid | 0 |
Total cash changes | (71,224) |
Non-cash changes: |  |
Amortization of issue costs | 0 |
Dividends declared | 31,645 |
Interest expense | 0 |
Foreign exchange | 0 |
Total non-cash changes | 31,645 |
Ending balance | 0 | 39,579
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 |
Total cash changes | 0 |
Non-cash changes: |  |
Amortization of issue costs | 0 |
Dividends declared | 0 |
Interest expense | 0 |
Foreign exchange | 0 |
Total non-cash changes | 0 |
Ending balance | $ 1,862,652 | $ 1,862,652

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