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PROPERTY, PLANT AND EQUIPMENT (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipment [abstract]    
Gross book value of fully depreciated property, plant and equipment still in use $ 136,811 $ 116,386
Commitments for the acquisition of aircraft [1] $ 15,400,000 $ 15,100,000
[1] Acording to the manufacturer's price list.