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Other financial assets
12 Months Ended
Dec. 31, 2018
Statements [Line Items]  
Other financial assets [text block]
10.
Other financial assets
 
   Dec. 31, 2018  Dec. 31, 2017  Jan. 1, 2017 
      (Restated)  (Restated) 
 Current         
 Derivative assets$ 6,628 $ 2,841 $ 3,397 
 Restricted cash 3,738     
  $ 10,366 $ 2,841 $ 3,397 
           
 Non-current         
 Investments at fair value through profit or loss 15,159  22,255  13,700 
 Restricted cash   206  17,148 
   15,159  22,461  30,848 
  $ 25,525 $ 25,302 $ 34,245 

Investments at fair value through profit or loss consist of securities in Canadian metals and mining companies, all of which are publicly traded. The change in investments at fair value through profit or loss is mostly attributed to fluctuation in market price, foreign exchange impact and net disposals.