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Significant accounting policies - Leases (Details) - CAD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease liabilities $ 18,122    
Current portion of operating lease liabilities 4,004 $ 3,799  
Non-current portion of operating lease liabilities 14,118 17,710  
Operating lease right-of-use assets 18,192 21,841  
Less: current portion of leases 26,895 29,206  
Finance lease obligations, noncurrent $ 42,577 $ 47,072  
Topic 842      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease liabilities     $ 17,410
Current portion of operating lease liabilities     3,407
Non-current portion of operating lease liabilities     14,003
Operating lease right-of-use assets     16,021
Deferred lease inducements     1,389
Less: current portion of leases     32,250
Finance lease obligations, noncurrent     54,318
Reclassification from current capital lease obligations     32,250
Reclassification from non-current capital lease obligations     $ 54,318