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OTHER REQUIRED DISCLOSURES (Financial debt reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance $ (1,218,635) $ (1,521,023)
Cash flows (2,052,414) 268,494
Reclassifications 0 0
Acquisitions - finance leases (76,879)  
Foreign exchange adjustments (47,894) (18,836)
Other non cash movements 96,880 52,730
Liabilities arising from financing activities, ending balance (3,298,942) (1,218,635)
Finance lease liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance 0 0
Cash flows 364 0
Reclassifications 0 0
Acquisitions - finance leases (76,879)  
Foreign exchange adjustments (14,949) 0
Other non cash movements 14,429 0
Liabilities arising from financing activities, ending balance (77,035) 0
Short-term borrowings    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance (821,893) (913,786)
Cash flows (540,918) 302,648
Reclassifications (192,547) (246,182)
Acquisitions - finance leases 0  
Foreign exchange adjustments (32,574) (17,245)
Other non cash movements 82,362 52,672
Liabilities arising from financing activities, ending balance (1,505,570) (821,893)
Long-term borrowings    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance (396,742) (607,237)
Cash flows (1,511,860) (34,154)
Reclassifications 192,547 246,182
Acquisitions - finance leases 0  
Foreign exchange adjustments (371) (1,591)
Other non cash movements 89 58
Liabilities arising from financing activities, ending balance $ (1,716,337) $ (396,742)