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FINANCIAL RISK MANAGEMENT (Investments in financial assets - credit risk) (Details) - Credit risk - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 537,882 $ 519,965
Other Investments - Current and Non-Current    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 816,157 215,273
Fixed Income (time-deposit, zero-coupon bonds, commercial papers)    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 579,917 176,470
Deposit certificates    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 451,857 160,933
Commercial papers    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 128,060 15,537
Bonds and other fixed income    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 233,611 38,803
Non - U.S. government securities    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 135,671 914
Corporate securities    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 97,940 37,889
Other notes    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 2,629 $ 0