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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)

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