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FINANCIAL RISK MANAGEMENT (Financial assets and liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financial assets [abstract] |  |  |  |  |  |  |
Receivables | $ 153,527 |  | $ 406,370 |  |  |  |
Derivative financial instruments | 1,572 |  | 1,196 |  |  |  |
Trade receivables | 918,438 |  | 950,569 |  |  |  |
Other investments | 816,157 |  | 215,273 |  |  |  |
Cash and cash equivalents | 537,882 | [1] | 519,965 | [1] | $ 250,541 | [1] | $ 337,779
Total Assets | 2,427,576 |  | 2,093,373 |  |  |  |
Financial liabilities [abstract] |  |  |  |  |  |  |
Other liabilities | 86,070 |  | 88,403 |  |  |  |
Trade payables | 1,004,216 |  | 836,204 |  |  |  |
Derivative financial liabilities | 6,358 |  | 3,024 |  |  |  |
Finance lease liabilities | 294,103 |  | 338,765 |  | $ 73,828 |  |
Borrowings | 1,722,893 |  | 2,188,674 |  |  |  |
Total Liabilities | 3,113,640 |  | 3,455,070 |  |  |  |
Liabilities at fair value through profit or loss |  |  |  |  |  |  |
Financial liabilities [abstract] |  |  |  |  |  |  |
Other liabilities | 0 |  | 0 |  |  |  |
Trade payables | 0 |  | 0 |  |  |  |
Derivative financial liabilities | 6,358 |  | 3,024 |  |  |  |
Finance lease liabilities | 0 |  | 0 |  |  |  |
Borrowings | 0 |  | 0 |  |  |  |
Total Liabilities | 6,358 |  | 3,024 |  |  |  |
Amortized cost |  |  |  |  |  |  |
Financial liabilities [abstract] |  |  |  |  |  |  |
Other liabilities | 86,070 |  | 88,403 |  |  |  |
Trade payables | 1,004,216 |  | 836,204 |  |  |  |
Derivative financial liabilities | 0 |  | 0 |  |  |  |
Finance lease liabilities | 294,103 |  | 338,765 |  |  |  |
Borrowings | 1,722,893 |  | 2,188,674 |  |  |  |
Total Liabilities | 3,107,282 |  | 3,452,046 |  |  |  |
Amortized cost |  |  |  |  |  |  |
Financial assets [abstract] |  |  |  |  |  |  |
Receivables | 153,527 |  | 406,370 |  |  |  |
Derivative financial instruments | 0 |  | 0 |  |  |  |
Trade receivables | 918,438 |  | 950,569 |  |  |  |
Other investments | 579,917 |  | 176,470 |  |  |  |
Cash and cash equivalents | 278,862 |  | 320,088 |  |  |  |
Total Assets | 1,930,744 |  | 1,853,497 |  |  |  |
Assets at fair value through profit or loss |  |  |  |  |  |  |
Financial assets [abstract] |  |  |  |  |  |  |
Receivables | 0 |  | 0 |  |  |  |
Derivative financial instruments | 1,572 |  | 1,196 |  |  |  |
Trade receivables | 0 |  | 0 |  |  |  |
Other investments | 2,629 |  | 0 |  |  |  |
Cash and cash equivalents | 259,020 |  | 199,877 |  |  |  |
Total Assets | 263,221 |  | 201,073 |  |  |  |
Assets at fair value through OCI |  |  |  |  |  |  |
Financial assets [abstract] |  |  |  |  |  |  |
Receivables | 0 |  | 0 |  |  |  |
Derivative financial instruments | 0 |  | 0 |  |  |  |
Trade receivables | 0 |  | 0 |  |  |  |
Other investments | 233,611 |  | 38,803 |  |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |  |
Total Assets | $ 233,611 |  | $ 38,803 |  |  |  |
[1] | It includes restricted cash of $54, $69 and $2,216 as of December 31, 2020, 2019 and 2018, respectively. In addition, the Company had other investments with a maturity of more than three months for $813,527, $212,271 and $44,529 as of December 31, 2020, 2019 and 2018, respectively.

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