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Supplementary cash flow information (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Change in Cash Flow Information
    

December 31, 2017

$

     

December 31, 2016

$

  

Changes in non-cash working capital

      

Accounts receivable and other

      (2,456)        17,168  

Inventories

      (31,437)        (18,264)  

Accounts payable and accrued liabilities

      (1,862)        33,391  

Total

      (35,755)        32,295  

Supplementary cash flow information

      

Income taxes paid

      42,293        48,653  

Interest paid

      36,750        37,114