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Accounts receivable and other (Tables)
12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Accounts Receivable and Other
    

      December 31, 2017

$

    

    December 31, 2016

$

 

Trade receivables

     7,746        11,053  

Value added and other taxes recoverable

     44,717        22,156  

Other receivables and advances

     7,134        8,208   

Prepaid expenses and deposits

     18,747        12,898  
     78,344        54,315