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Commitments and contingencies (Movements in prepayments on flight equipment) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Deposits on Flight Equipment [Roll Forward]    
Prepayments on flight equipment at beginning of period $ 2,954,478 $ 3,024,520
Prepayments during the period 685,051 522,887
Interest paid and capitalized during the period 31,830 53,905
Prepayments and capitalized interest applied to the purchase of flight equipment (301,263) (639,945)
Prepayments on flight equipment at end of period $ 3,370,096 $ 2,961,367