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FINANCIAL RISK MANAGEMENT (Financial assets and liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | [1] | Dec. 31, 2014
--- | --- | --- | --- | --- | ---
Financial assets [abstract] |  |  |  |  |  |
Receivables | $ 488,718 |  | $ 127,241 |  |  |
Derivative financial instruments | 2,304 |  | 316 |  |  |
Trade receivables | 1,011,430 |  |  |  |  |
Trade receivables, net |  |  | 635,015 |  |  |
Other investments | 135,865 |  | 150,851 |  |  |
Cash and cash equivalents | 337,779 | [1] | 183,463 | [1] | $ 151,491 | $ 213,303
Total Assets | 1,976,096 |  | 1,096,886 |  |  |
Financial liabilities [abstract] |  |  |  |  |  |
Other liabilities | 116,549 |  | 35,107 |  |  |
Trade payables | 860,767 |  | 580,941 |  |  |
Derivative financial liabilities | 6,001 |  | 287 |  |  |
Finance lease liabilities | 77,035 |  |  |  |  |
Borrowings | 3,221,907 |  | 1,218,635 |  |  |
Total Liabilities | 4,282,259 |  | 1,834,970 |  |  |
Derivatives |  |  |  |  |  |
Financial liabilities [abstract] |  |  |  |  |  |
Other liabilities | 0 |  | 0 |  |  |
Trade payables | 0 |  | 0 |  |  |
Derivative financial liabilities | 6,001 |  | 287 |  |  |
Finance lease liabilities | 0 |  |  |  |  |
Borrowings | 0 |  | 0 |  |  |
Total Liabilities | 6,001 |  | 287 |  |  |
Other financial liabilities |  |  |  |  |  |
Financial liabilities [abstract] |  |  |  |  |  |
Other liabilities | 116,549 |  | 35,107 |  |  |
Trade payables | 860,767 |  | 580,941 |  |  |
Derivative financial liabilities | 0 |  | 0 |  |  |
Finance lease liabilities | 77,035 |  |  |  |  |
Borrowings | 3,221,907 |  | 1,218,635 |  |  |
Total Liabilities | 4,276,258 |  | 1,834,683 |  |  |
Held to maturity |  |  |  |  |  |
Financial liabilities [abstract] |  |  |  |  |  |
Other liabilities | 0 |  | 0 |  |  |
Trade payables | 0 |  | 0 |  |  |
Derivative financial liabilities | 0 |  | 0 |  |  |
Finance lease liabilities | 0 |  |  |  |  |
Borrowings | 0 |  | 0 |  |  |
Total Liabilities | 0 |  | 0 |  |  |
Loans and receivables |  |  |  |  |  |
Financial assets [abstract] |  |  |  |  |  |
Receivables | 488,718 |  | 127,241 |  |  |
Derivative financial instruments | 0 |  | 0 |  |  |
Trade receivables | 1,011,430 |  |  |  |  |
Trade receivables, net |  |  | 635,015 |  |  |
Other investments | 30,231 |  | 52,995 |  |  |
Cash and cash equivalents | 101,444 |  | 83,437 |  |  |
Total Assets | 1,631,823 |  | 898,688 |  |  |
Assets at fair value through profit and loss |  |  |  |  |  |
Financial assets [abstract] |  |  |  |  |  |
Receivables | 0 |  | 0 |  |  |
Derivative financial instruments | 2,304 |  | 316 |  |  |
Trade receivables | 0 |  |  |  |  |
Trade receivables, net |  |  | 0 |  |  |
Other investments | 99,505 |  | 83,117 |  |  |
Cash and cash equivalents | 236,335 |  | 100,026 |  |  |
Total Assets | 338,144 |  | 183,459 |  |  |
Held to maturity |  |  |  |  |  |
Financial assets [abstract] |  |  |  |  |  |
Receivables | 0 |  | 0 |  |  |
Derivative financial instruments | 0 |  | 0 |  |  |
Trade receivables | 0 |  |  |  |  |
Trade receivables, net |  |  | 0 |  |  |
Other investments | 6,129 |  | 14,739 |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |
Total Assets | $ 6,129 |  | $ 14,739 |  |  |
[1] | It includes restricted cash of USD 50, USD 83 and USD 88 as of December 31, 2017, 2016 and 2015, respectively. In addition, the Company had other investments with a maturity of more than three months for USD 135,864, USD 150,851 and USD 237,191 as of December 31, 2017, 2016 and 2015, respectively.

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