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OTHER FINANCIAL ASSETS (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 02, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Current Assets | $ 383,984 | $ 275,549 | $ 559,919
Non-current assets | 58,700 |  | 88,090
Total Assets | 442,684 |  | 648,009
Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 341,233 |  | 497,571
Non-current assets | 58,700 |  | 87,571
Total Assets | 399,933 |  | 585,142
Hedging Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 23,355 |  | 62,348
Non-current assets |  |  | 519
Total Assets | 23,355 |  | 62,867
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
Non-current assets |  |  |
Total Assets |  |  | 202
Hedging Assets Categories [Member] | Fair Value Of Interest Rate Derivatives [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 19,460 |  | 3,113
Non-current assets |  |  |
Total Assets | 19,460 |  | 3,113
Hedging Assets Categories [Member] | Fair Value Of Foreign Currency Derivatives [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 3,895 |  | 48,322
Non-current assets |  |  | 519
Total Assets | 3,895 |  | 48,841
Hedging Assets Categories [Member] | Fair Value Of Fuel Price Derivatives [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  |  | 10,711
Non-current assets |  |  |
Total Assets |  |  | 10,711
Derivatives Not Recognized As A Hedge Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 19,396 |  |
Non-current assets |  |  |
Total Assets | 19,396 |  |
Derivatives Not Recognized As A Hedge Categories [Member] | Foreign Currency Derivatives Not Recognized As A Hedge [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 19,396 |  |
Non-current assets |  |  |
Total Assets | 19,396 |  |
Private Investment Funds [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 322,428 |  | 472,232
Non-current assets |  |  |
Total Assets | 322,428 |  | 472,232
Deposits In Guarantee (Aircraft) [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 9,610 |  | 15,690
Non-current assets | 37,636 |  | 41,058
Total Assets | 47,246 |  | 56,748
Guarantees For Margins Of Derivatives [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 661 |  | 2,197
Non-current assets |  |  |
Total Assets | 661 |  | 2,197
Other Investments [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets |  |  |
Non-current assets | 494 |  | 494
Total Assets | 494 |  | 494
Domestic And Foreign Bonds [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 1,394 |  | 1,421
Non-current assets |  |  |
Total Assets | 1,394 |  | 1,421
Other Guarantees Given [Member] | Other Financial Assets Categories [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Current Assets | 7,140 |  | 6,031
Non-current assets | 20,570 |  | 46,019
Total Assets | $ 27,710 |  | $ 52,050

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