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Other liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other Liabilities [Abstract]    
Deferred sales $ 17,418 $ 30,727
Derivatives 12,524 61,387
Accrued pension and post-retirement benefit liability 80,737 68,255
Lease obligation 12,869 0
Other 63,452 61,265
Total other liabilities 187,000 221,634
Less current portion (33,073) (79,573)
Net $ 153,927 $ 142,061