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Other liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities [Abstract]    
Deferred sales $ 29,148 $ 29,423
Derivatives 23,414 58,885
Accrued pension and post-retirement benefit liability 74,804 69,699
Other 53,107 25,725
Total other liabilities 180,473 183,732
Less current portion (54,370) (60,744)
Net $ 126,103 $ 122,988