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FINANCIAL RISK MANAGEMENT (Details 5) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Other financial assets, current | $ 3,745,499 | $ 3,626,775
Other financial assets, not current | 15,052,473 | 15,571,419
Liabilities |  |
Other financial liabilities , current | 8,688,022 | 8,790,699
Other financial liabilities, non current | 5,842,714 | 6,222,191
Level 1 [Member] | Other Financial Liabilities , Current [Member] |  |
Liabilities |  |
Other financial liabilities , current |  |
Level 1 [Member] | Interest Accrued Since The Last Payment Date Of Currency Swap [Member] |  |
Liabilities |  |
Other financial liabilities , current |  |
Level 1 [Member] | Other Financial Liabilities, Non Current [Member] |  |
Liabilities |  |
Other financial liabilities, non current |  |
Level 2 [Member] | Other Financial Liabilities , Current [Member] |  |
Liabilities |  |
Other financial liabilities , current | 12,200 | 24,881
Level 2 [Member] | Interest Accrued Since The Last Payment Date Of Currency Swap [Member] |  |
Liabilities |  |
Other financial liabilities , current | 1,189 | 2,147
Level 2 [Member] | Other Financial Liabilities, Non Current [Member] |  |
Liabilities |  |
Other financial liabilities, non current | 2,617 | 6,679
Level 3 [Member] | Other Financial Liabilities , Current [Member] |  |
Liabilities |  |
Other financial liabilities , current |  |
Level 3 [Member] | Interest Accrued Since The Last Payment Date Of Currency Swap [Member] |  |
Liabilities |  |
Other financial liabilities , current |  |
Level 3 [Member] | Other Financial Liabilities, Non Current [Member] |  |
Liabilities |  |
Other financial liabilities, non current |  |
Fuel Derivative [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current |  |
Fuel Derivative [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current | 10,711 | 10,088
Fuel Derivative [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Fair Value Of Foreign Currency Derivatives [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current |  |
Other financial assets, not current |  |
Fair Value Of Foreign Currency Derivatives [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current | 48,322 | 1,259
Other financial assets, not current | 519 |
Fair Value Of Foreign Currency Derivatives [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Other financial assets, not current |  |
Fair Value Of Interest Rate Derivatives [Member] | Level 1 [Member] |  |
Liabilities |  |
Other financial liabilities , current |  |
Other financial liabilities, non current |  |
Fair Value Of Interest Rate Derivatives [Member] | Level 2 [Member] |  |
Liabilities |  |
Other financial liabilities , current | 8,919 | 9,579
Other financial liabilities, non current | 8,919 | 6,679
Fair Value Of Interest Rate Derivatives [Member] | Level 3 [Member] |  |
Liabilities |  |
Other financial liabilities , current |  |
Other financial liabilities, non current |  |
Fair Value Of Foreign Currency Derivatives [Member] | Level 1 [Member] |  |
Liabilities |  |
Other financial liabilities , current |  |
Fair Value Of Foreign Currency Derivatives [Member] | Level 2 [Member] |  |
Liabilities |  |
Other financial liabilities , current | 2,092 | 13,155
Fair Value Of Foreign Currency Derivatives [Member] | Level 3 [Member] |  |
Liabilities |  |
Other financial liabilities , current |  |
Fair Value Derived Interest Rate [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current |  |
Fair Value Derived Interest Rate [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current | 3,113 |
Fair Value Derived Interest Rate [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Cash And Cash Equivalents [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current | 29,658 | 15,522
Cash And Cash Equivalents [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current |  |
Cash And Cash Equivalents [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Short-Term Mutual Funds [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current | 29,658 | 15,522
Short-Term Mutual Funds [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current |  |
Short-Term Mutual Funds [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Other Financial Assets, Current [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current | 473,653 | 536,991
Other Financial Assets, Current [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current | 62,348 | 11,411
Other Financial Assets, Current [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Interest Accrued Since The Last Payment Date Of Cross Currency Swap [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current |  |
Interest Accrued Since The Last Payment Date Of Cross Currency Swap [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current | 202 | 64
Interest Accrued Since The Last Payment Date Of Cross Currency Swap [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Private Investment Funds [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current | 472,232 | 536,991
Private Investment Funds [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current |  |
Private Investment Funds [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Domestic And Foreign Bonds [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, current | 1,421 |
Domestic And Foreign Bonds [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, current |  |
Domestic And Foreign Bonds [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, current |  |
Other Financial Assets, Not Current [Member] | Level 1 [Member] |  |
Assets |  |
Other financial assets, not current |  |
Other Financial Assets, Not Current [Member] | Level 2 [Member] |  |
Assets |  |
Other financial assets, not current | 519 |
Other Financial Assets, Not Current [Member] | Level 3 [Member] |  |
Assets |  |
Other financial assets, not current |  |
Fair Value [Member] | Other Financial Liabilities , Current [Member] |  |
Liabilities |  |
Other financial liabilities , current | 12,200 | 24,881
Fair Value [Member] | Interest Accrued Since The Last Payment Date Of Currency Swap [Member] |  |
Liabilities |  |
Other financial liabilities , current | 1,189 | 2,147
Fair Value [Member] | Other Financial Liabilities, Non Current [Member] |  |
Liabilities |  |
Other financial liabilities, non current | 2,617 | 6,679
Fair Value [Member] | Fuel Derivative [Member] |  |
Assets |  |
Other financial assets, current | 10,711 | 10,088
Fair Value [Member] | Fair Value Of Foreign Currency Derivatives [Member] |  |
Assets |  |
Other financial assets, current | 48,322 | 1,259
Other financial assets, not current | 519 |
Fair Value [Member] | Fair Value Of Interest Rate Derivatives [Member] |  |
Liabilities |  |
Other financial liabilities , current | 8,919 | 9,579
Other financial liabilities, non current | 8,919 | 6,679
Fair Value [Member] | Fair Value Of Foreign Currency Derivatives [Member] |  |
Liabilities |  |
Other financial liabilities , current | 2,092 | 13,155
Fair Value [Member] | Fair Value Derived Interest Rate [Member] |  |
Assets |  |
Other financial assets, current | 3,113 |
Fair Value [Member] | Cash And Cash Equivalents [Member] |  |
Assets |  |
Other financial assets, current | 29,658 | 15,522
Fair Value [Member] | Short-Term Mutual Funds [Member] |  |
Assets |  |
Other financial assets, current | 29,658 | 15,522
Fair Value [Member] | Other Financial Assets, Current [Member] |  |
Assets |  |
Other financial assets, current | 536,001 | 548,402
Fair Value [Member] | Interest Accrued Since The Last Payment Date Of Cross Currency Swap [Member] |  |
Assets |  |
Other financial assets, current | 202 | 64
Fair Value [Member] | Private Investment Funds [Member] |  |
Assets |  |
Other financial assets, current | 472,232 | 536,991
Fair Value [Member] | Domestic And Foreign Bonds [Member] |  |
Assets |  |
Other financial assets, current | 1,421 |
Fair Value [Member] | Other Financial Assets, Not Current [Member] |  |
Assets |  |
Other financial assets, not current | $ 519 |

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