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Fair value measurements - Loss gain from financial instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair value measurements      
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income $ (1,175) $ 336 $ 957
Reclassification amount   109,000 109,000
Fair value      
Fair value measurements      
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income (1,175) 336 80,033
Jet fuel Asian call options contracts | Fair value      
Fair value measurements      
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income     601
Jet fuel Zero cost collars | Fair value      
Fair value measurements      
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income     484
Interest rate Cap | Fair value      
Fair value measurements      
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income (1,175) 336 (128)
Non derivative financial instruments | Fair value      
Fair value measurements      
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income     79,076
Fuel cost | Jet fuel Asian call options contracts      
Fair value measurements      
Loss from derivatives financial instruments recognized in consolidated statements of operations     (619)
Finance cost | Interest rate Cap      
Fair value measurements      
Loss from derivatives financial instruments recognized in consolidated statements of operations $ (579) $ (161) $ (69)