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FINANCIAL INSTRUMENTS - Foreign currency risk management (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / $
Dec. 31, 2018
$ / $
Dec. 31, 2017
$ / $
Financial Instruments [Abstract]      
Percentage of entity's revenue 86.30%    
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Devaluation of foreign exchange, percent 59.02% 102.20%  
Average foreign exchange rate | $ / $ 59.79 37.60 18.60
Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Amount $ (6,822)    
% Increase, Amount (946)    
% Decrease, Amount (753)    
Argentine peso (ARS) | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Amount $ 8,023    
% Increase 40.00%    
% Increase, Amount $ (2,292)    
% Decrease 10.00%    
% Decrease, Amount $ 891    
Chilean pesos | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Amount $ (2,789)    
% Increase 10.00%    
% Increase, Amount $ 254    
% Decrease 10.00%    
% Decrease, Amount $ (310)    
Colombian peso (COP) | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Amount $ (7,770)    
% Increase 10.00%    
% Increase, Amount $ 706    
% Decrease 10.00%    
% Decrease, Amount $ (863)    
Indian rupees | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Amount $ (252)    
% Increase 10.00%    
% Increase, Amount $ 23    
% Decrease 10.00%    
% Decrease, Amount $ (28)    
Uruguayan pesos | Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Amount $ (4,034)    
% Increase 10.00%    
% Increase, Amount $ 363    
% Decrease 10.00%    
% Decrease, Amount $ (443)