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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) |  |

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