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FINANCIAL RISK MANAGEMENT - Credit Risk (Details) - Credit risk - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 980,879 $ 597,191
Cash and cash equivalents    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 860,637 503,647
Trade receivables    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 38,456 54,164
Value Added Tax (VAT) Receivable [Member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 30,279 21,416
Restricted cash    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 35,288 2,339
Other current and non-current financial assets    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 16,219 $ 15,625