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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