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FINANCIAL RISK MANAGEMENT (Financial assets and liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
 [1]
Dec. 31, 2014
Financial assets [abstract]        
Receivables $ 488,718 $ 127,241    
Derivative financial instruments 2,304 316    
Trade receivables 1,011,430      
Trade receivables, net   635,015    
Other investments 135,865 150,851    
Cash and cash equivalents 337,779 [1] 183,463 [1] $ 151,491 $ 213,303
Total Assets 1,976,096 1,096,886    
Financial liabilities [abstract]        
Other liabilities 116,549 35,107    
Trade payables 860,767 580,941    
Derivative financial liabilities 6,001 287    
Finance lease liabilities 77,035      
Borrowings 3,221,907 1,218,635    
Total Liabilities 4,282,259 1,834,970    
Derivatives        
Financial liabilities [abstract]        
Other liabilities 0 0    
Trade payables 0 0    
Derivative financial liabilities 6,001 287    
Finance lease liabilities 0      
Borrowings 0 0    
Total Liabilities 6,001 287    
Other financial liabilities        
Financial liabilities [abstract]        
Other liabilities 116,549 35,107    
Trade payables 860,767 580,941    
Derivative financial liabilities 0 0    
Finance lease liabilities 77,035      
Borrowings 3,221,907 1,218,635    
Total Liabilities 4,276,258 1,834,683    
Held to maturity        
Financial liabilities [abstract]        
Other liabilities 0 0    
Trade payables 0 0    
Derivative financial liabilities 0 0    
Finance lease liabilities 0      
Borrowings 0 0    
Total Liabilities 0 0    
Loans and receivables        
Financial assets [abstract]        
Receivables 488,718 127,241    
Derivative financial instruments 0 0    
Trade receivables 1,011,430      
Trade receivables, net   635,015    
Other investments 30,231 52,995    
Cash and cash equivalents 101,444 83,437    
Total Assets 1,631,823 898,688    
Assets at fair value through profit and loss        
Financial assets [abstract]        
Receivables 0 0    
Derivative financial instruments 2,304 316    
Trade receivables 0      
Trade receivables, net   0    
Other investments 99,505 83,117    
Cash and cash equivalents 236,335 100,026    
Total Assets 338,144 183,459    
Held to maturity        
Financial assets [abstract]        
Receivables 0 0    
Derivative financial instruments 0 0    
Trade receivables 0      
Trade receivables, net   0    
Other investments 6,129 14,739    
Cash and cash equivalents 0 0    
Total Assets $ 6,129 $ 14,739    
[1] It includes restricted cash of USD 50, USD 83 and USD 88 as of December 31, 2017, 2016 and 2015, respectively. In addition, the Company had other investments with a maturity of more than three months for USD 135,864, USD 150,851 and USD 237,191 as of December 31, 2017, 2016 and 2015, respectively.