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Additional information on the consolidated statements of cash flows (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure Of Cash Flow Statement [Abstract]  
Disclosure of detailed information about cash flow information [Table Text Block]
        2019     2018  
        $     $  
                 
Interests received measured using the effective rate method   2,583     3,944  
Interests paid on long-term debt   15,680     21,126  
Dividends received   150     328  
Income taxes paid   797     822  
             
Changes in non-cash working capital items            
  Decrease (increase) in amounts receivable   4,929     (8,613 )
  Decrease (increase) in other current assets   (1,449 )   9,828  
  Increase (decrease) in accounts payable and accrued liabilities   (8,260 )   (3,834 )
        (4,780 )   (2,619 )
                 
Tax credits receivable related to exploration and evaluation assets            
    Beginning of year   281     4,091  
    End of year (i)   936     281  

(i) Balance as at December 31, 2019 from the acquisition of Barkerville (Note 7).