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FINANCIAL RISK MANAGEMENT (Details 6) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of fair value measurement of assets [line items]        
Cash and cash equivalents $ 1,142,004 $ 949,327 $ 753,497 $ 989,396
Cash on hand 8,562 8,630    
Bank balance 330,430 255,746    
Overnight 239,292 295,060    
Other financial assets, current 559,919 712,828    
Other financial assets 221,188 212,242    
Trade debtors, other accounts receivable and Current accounts receivable 1,214,050 1,107,889    
Accounts receivable from entities related, current 1,175,796 1,022,933    
Other financial assets 88,090 102,125    
Other current financial liabilities 1,300,949 1,839,528    
Accounts payable for trade and other accounts payable, current 1,695,202 1,593,068    
Accounts payable to entities related, current 760 269    
Other financial liabilities, not current 6,605,508 6,796,952    
Accounts payable, not current 498,832 359,391    
Fair Value [Member]        
Disclosure of fair value measurement of assets [line items]        
Cash and cash equivalents 1,112,346 933,805    
Cash on hand 8,562 8,630    
Bank balance 330,430 255,746    
Overnight 239,292 295,060    
Time deposits 534,062 374,369    
Other financial assets, current 23,918 164,426    
Other financial assets 23,918 164,426    
Trade debtors, other accounts receivable and Current accounts receivable 1,214,050 1,107,889    
Accounts receivable from entities related, current 2,582 554    
Other financial assets 87,571 102,125    
Accounts receivable, non-current 6,891 8,254    
Other current financial liabilities 1,288,749 1,814,647    
Accounts payable for trade and other accounts payable, current 1,695,202 1,593,068    
Accounts payable to entities related, current 760 269    
Other financial liabilities, not current 6,602,891 6,790,273    
Accounts payable, not current 498,832 359,391    
Book Value [Member]        
Disclosure of fair value measurement of assets [line items]        
Cash and cash equivalents 1,112,346 933,805    
Cash on hand 8,562 8,630    
Bank balance 330,430 255,746    
Overnight 239,292 295,060    
Time deposits 534,062 374,369    
Other financial assets, current 23,918 164,426    
Other financial assets 23,918 164,426    
Trade debtors, other accounts receivable and Current accounts receivable 1,214,050 1,107,889    
Accounts receivable from entities related, current 2,582 554    
Other financial assets 87,571 102,125    
Accounts receivable, non-current 6,891 8,254    
Other current financial liabilities 1,499,495 2,022,290    
Accounts payable for trade and other accounts payable, current 1,695,202 1,593,068    
Accounts payable to entities related, current 760 269    
Other financial liabilities, not current 6,738,872 6,970,375    
Accounts payable, not current $ 498,832 $ 359,391