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FINANCIAL RISK MANAGEMENT (Financial assets and liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial assets [abstract]        
Receivables $ 153,527 $ 406,370    
Derivative financial instruments 1,572 1,196    
Trade receivables 918,438 950,569    
Other investments 816,157 215,273    
Cash and cash equivalents 537,882 [1] 519,965 [1] $ 250,541 [1] $ 337,779
Total Assets 2,427,576 2,093,373    
Financial liabilities [abstract]        
Other liabilities 86,070 88,403    
Trade payables 1,004,216 836,204    
Derivative financial liabilities 6,358 3,024    
Finance lease liabilities 294,103 338,765 $ 73,828  
Borrowings 1,722,893 2,188,674    
Total Liabilities 3,113,640 3,455,070    
Liabilities at fair value through profit or loss        
Financial liabilities [abstract]        
Other liabilities 0 0    
Trade payables 0 0    
Derivative financial liabilities 6,358 3,024    
Finance lease liabilities 0 0    
Borrowings 0 0    
Total Liabilities 6,358 3,024    
Amortized cost        
Financial liabilities [abstract]        
Other liabilities 86,070 88,403    
Trade payables 1,004,216 836,204    
Derivative financial liabilities 0 0    
Finance lease liabilities 294,103 338,765    
Borrowings 1,722,893 2,188,674    
Total Liabilities 3,107,282 3,452,046    
Amortized cost        
Financial assets [abstract]        
Receivables 153,527 406,370    
Derivative financial instruments 0 0    
Trade receivables 918,438 950,569    
Other investments 579,917 176,470    
Cash and cash equivalents 278,862 320,088    
Total Assets 1,930,744 1,853,497    
Assets at fair value through profit or loss        
Financial assets [abstract]        
Receivables 0 0    
Derivative financial instruments 1,572 1,196    
Trade receivables 0 0    
Other investments 2,629 0    
Cash and cash equivalents 259,020 199,877    
Total Assets 263,221 201,073    
Assets at fair value through OCI        
Financial assets [abstract]        
Receivables 0 0    
Derivative financial instruments 0 0    
Trade receivables 0 0    
Other investments 233,611 38,803    
Cash and cash equivalents 0 0    
Total Assets $ 233,611 $ 38,803    
[1] It includes restricted cash of $54, $69 and $2,216 as of December 31, 2020, 2019 and 2018, respectively. In addition, the Company had other investments with a maturity of more than three months for $813,527, $212,271 and $44,529 as of December 31, 2020, 2019 and 2018, respectively.