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FINANCIAL INSTRUMENTS - Reconciliation of Carrying Amount of Financial Instruments Classified as Level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of the carrying amount of financial instruments [abstract]      
Foreign exchange $ 38 $ (790) $ 1,945
Valuation adjustment made to non-controlling interest put options (2,470) (3,339) 0
Level 3 | Non-controlling interest put options      
Reconciliation of the carrying amount of financial instruments [abstract]      
Balance at the beginning of the year 13,634 10,499  
Foreign exchange (346) (204)  
Valuation adjustment made to non-controlling interest put options 2,470 3,339  
Balance at the end of the year $ 15,758 $ 13,634 $ 10,499