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OTHER NON-FINANCIAL ASSETS (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
OTHER NON-FINANCIAL ASSETS (Details) [Line Items]          
Reserve maintain $ (367,577) $ (4,365) $ 554,884 $ 760,761 $ 580,870
Number of aircraft under operating leases 8        
Aircraft [member]          
OTHER NON-FINANCIAL ASSETS (Details) [Line Items]          
Reserve maintain $ 45,831 $ 52,667