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FINANCIAL RISK MANAGEMENT (Financial assets and liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Dec. 31, 2015
Financial assets [abstract]        
Receivables $ 449,077 $ 488,718    
Derivative financial instruments 1,588 2,304    
Trade receivables 1,133,236      
Trade receivables, net   1,011,430    
Other investments 51,473 135,865    
Cash and cash equivalents 250,541 [1] 337,779 [1] $ 183,463 $ 151,491
Total Assets 1,885,915 1,976,096    
Financial liabilities [abstract]        
Other liabilities 105,659 116,549    
Trade payables 864,827 860,767    
Derivative financial liabilities 12,981 6,001    
Finance lease liabilities 73,828 77,035    
Borrowings 2,036,957 3,221,907    
Total Liabilities 3,094,252 4,282,259    
Derivatives        
Financial liabilities [abstract]        
Other liabilities   0    
Trade payables   0    
Derivative financial liabilities   6,001    
Finance lease liabilities   0    
Borrowings   0    
Total Liabilities   6,001    
Liabilities at fair value through profit or loss        
Financial liabilities [abstract]        
Other liabilities 0      
Trade payables 0      
Derivative financial liabilities 12,981      
Finance lease liabilities 0      
Borrowings 0      
Total Liabilities 12,981      
Amortized cost        
Financial liabilities [abstract]        
Other liabilities 105,659      
Trade payables 864,827      
Derivative financial liabilities 0      
Finance lease liabilities 73,828      
Borrowings 2,036,957      
Total Liabilities 3,081,271      
Held to maturity        
Financial liabilities [abstract]        
Other liabilities   0    
Trade payables   0    
Derivative financial liabilities   0    
Finance lease liabilities   0    
Borrowings   0    
Total Liabilities   0    
Other financial liabilities        
Financial liabilities [abstract]        
Other liabilities   116,549    
Trade payables   860,767    
Derivative financial liabilities   0    
Finance lease liabilities   77,035    
Borrowings   3,221,907    
Total Liabilities   4,276,258    
Loans and receivables        
Financial assets [abstract]        
Receivables   488,718    
Derivative financial instruments   0    
Trade receivables, net   1,011,430    
Other investments   30,231    
Cash and cash equivalents   101,444    
Total Assets   1,631,823    
Amortized cost        
Financial assets [abstract]        
Receivables 449,077      
Derivative financial instruments 0      
Trade receivables 1,133,236      
Other investments 14,843      
Cash and cash equivalents 110,086      
Total Assets 1,707,242      
Assets at fair value through profit or loss        
Financial assets [abstract]        
Receivables 0 0    
Derivative financial instruments 1,588 2,304    
Trade receivables 0      
Trade receivables, net   0    
Other investments 0 99,505    
Cash and cash equivalents 140,455 236,335    
Total Assets 142,043 338,144    
Assets at fair value through OCI        
Financial assets [abstract]        
Receivables 0      
Derivative financial instruments 0      
Trade receivables 0      
Other investments 36,630      
Cash and cash equivalents 0      
Total Assets $ 36,630      
Held to maturity        
Financial assets [abstract]        
Receivables   0    
Derivative financial instruments   0    
Trade receivables, net   0    
Other investments   6,129    
Cash and cash equivalents   0    
Total Assets   $ 6,129    
[1] It includes restricted cash of $2,216, $50 and $83 as of December 31, 2018, 2017 and 2016, respectively. In addition, the Company had other investments with a maturity of more than three months for $51,472, $135,864 and $150,851 as of December 31, 2018, 2017 and 2016, respectively.