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Components of accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative financial instruments:      
Net gain (loss) on cash flow hedges $ (1,175) $ 336 $ 957
Reclassification amount   109,000 109,000
Option contract      
Derivative financial instruments:      
Gains (losses) on cash flow hedges, before tax     601
Jet fuel Zero cost collars      
Derivative financial instruments:      
Gains (losses) on cash flow hedges, before tax     484
Interest rate Cap      
Derivative financial instruments:      
Gains (losses) on cash flow hedges, before tax (1,175) 336 (128)
Non derivative financial instruments      
Derivative financial instruments:      
Gains (losses) on cash flow hedges, before tax     79,076
Derivative and non-derivative financial instruments.      
Derivative financial instruments:      
Gains (losses) on cash flow hedges, before tax (1,175) 336 957
Net gain (loss) on cash flow hedges $ (1,175) $ 336 $ 80,033