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OTHER REQUIRED DISCLOSURES (Financial debt reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance $ (3,298,942) $ (1,218,635)
Cash flows 1,098,408 (2,052,414)
Reclassifications 0 0
Acquisitions - finance leases   (76,879)
Foreign exchange adjustments (169,191) (47,894)
Other non cash movements 258,940 96,880
Liabilities arising from financing activities, ending balance (2,110,785) (3,298,942)
Finance lease liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance (77,035) 0
Cash flows 7,565 364
Reclassifications 0 0
Acquisitions - finance leases   (76,879)
Foreign exchange adjustments (47,390) (14,949)
Other non cash movements 43,032 14,429
Liabilities arising from financing activities, ending balance (73,828) (77,035)
Short term borrowings    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance (1,505,570) (821,893)
Cash flows 1,492,568 (540,918)
Reclassifications (459,520) (192,547)
Acquisitions - finance leases   0
Foreign exchange adjustments (121,801) (32,574)
Other non cash movements 194,467 82,362
Liabilities arising from financing activities, ending balance (399,856) (1,505,570)
Long term borrowings    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance (1,716,337) (396,742)
Cash flows (401,725) (1,511,860)
Reclassifications 459,520 192,547
Acquisitions - finance leases   0
Foreign exchange adjustments 0 (371)
Other non cash movements 21,441 89
Liabilities arising from financing activities, ending balance $ (1,637,101) $ (1,716,337)