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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