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OTHER FINANCIAL LIABILITIES (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Cross currency swaps (CCS) [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Fair values of net assets/ (liabilities) [1] $ 38,875 $ (12,286)
Interest rate swaps [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Fair values of net assets/ (liabilities) [2] (6,542) (16,926)
Fuel Derivative [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Fair values of net assets/ (liabilities) [3] 10,711 10,088
Currency forward-options US$/GBP$ [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Fair values of net assets/ (liabilities) [4] 618
Currency forward-options US$/EUR$ [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Fair values of net assets/ (liabilities) [4] 109
Currency options R$/US$ [Member]    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Fair values of net assets/ (liabilities) [4] 4,370 (1,752)
Currency options CLP/US$    
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]    
Fair values of net assets/ (liabilities) [4] $ 636
[1] Covers the significant variations in cash flows associated with market risk implicit in the changes in the 3-month LIBOR interest rate and the exchange rate US$/UF of bank loans. These contracts are recorded as cash flow hedges and fair value.
[2] Covers the significant variations in cash flows associated with market risk implicit in the increases in the 3 months LIBOR interest rates for long-term loans incurred in the acquisition of aircraft and bank loans. These contracts are recorded as cash flow hedges.
[3] Covers significant variations in cash flows associated with market risk implicit in the changes in the price of future fuel purchases. These contracts are recorded as cash flow hedges.
[4] Covers the foreign exchange risk exposure of operating cash flows caused mainly by fluctuations in the exchange rate R$/US$, US$/EUR and US$/GBP. These contracts are recorded as cash flow hedges.