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OTHER FINANCIAL ASSETS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of financial assets [line items] |  |  |
Current Assets |  | $ 559,919 | $ 712,828
Non-current assets |  | 88,090 | 102,125
Total Assets |  | 648,009 | 814,953
Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 497,571 | 701,417
Non-current assets |  | 87,571 | 102,125
Total Assets |  | 585,142 | 803,542
Hedging Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 62,348 | 11,411
Non-current assets |  | 519 |
Total Assets |  | 62,867 | 11,411
Hedging Assets Categories [Member] | Interest Accrued Since The Last Payment Date Of Cross Currency Swap [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 202 | 64
Non-current assets |  |  |
Total Assets |  | 202 | 64
Hedging Assets Categories [Member] | Foreign Exchange Rate Risk [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | [1] | 48,322 | 1,259
Non-current assets | [1] | 519 |
Total Assets | [1] | 48,841 | 1,259
Hedging Assets Categories [Member] | Fuel-Price Risk [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 10,711 | 10,088
Non-current assets |  |  |
Total Assets |  | 10,711 | 10,088
Private Investment Funds [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 472,232 | 536,991
Non-current assets |  |  |
Total Assets |  | 472,232 | 536,991
Deposits In Guarantee (Aircraft) [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 15,690 | 16,819
Non-current assets |  | 41,058 | 56,846
Total Assets |  | 56,748 | 73,665
Guarantees For Margins Of Derivatives [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 2,197 | 939
Non-current assets |  |  |
Total Assets |  | 2,197 | 939
Other Investments [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  |  |
Non-current assets |  | 494 | 522
Total Assets |  | 494 | 522
Domestic And Foreign Bonds [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 1,421 |
Non-current assets |  |  |
Total Assets |  | 1,421 |
Other Guarantees Given [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  | 6,031 | 140,733
Non-current assets |  | 46,019 | 44,757
Total Assets |  | 52,050 | 185,490
Others [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  |  | 5,935
Non-current assets |  |  |
Total Assets |  |  | $ 5,935
[1] | The foreign currency derivatives correspond to forward and combination of options.

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