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FINANCIAL INSTRUMENTS - Liquidity risk management (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]        
Borrowings $ 51,386 $ 0 $ 6,011 $ 217
Lease liabilities 74,981      
Other financial liabilities 10,554      
TOTAL 136,921      
2020        
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]        
Borrowings 1,198      
Lease liabilities 20,002      
Other financial liabilities 8,937      
TOTAL 30,137      
2021        
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]        
Borrowings 0      
Lease liabilities 15,263      
Other financial liabilities 1,617      
TOTAL 16,880      
2022        
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]        
Borrowings 188      
Lease liabilities 11,552      
Other financial liabilities 0      
TOTAL 11,740      
Thereafter        
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]        
Borrowings 50,000      
Lease liabilities 28,164      
Other financial liabilities 0      
TOTAL $ 78,164