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Commitments and contingencies (Unrecorded contractual commitments for purchase of flight equipment) (Details) - Flight Equipment [Member] - Capital Addition Purchase Commitments [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]  
2018 $ 6,065,084 [1]
2019 5,723,097 [1]
2020 4,742,181 [1]
2021 3,714,523 [1]
2022 2,405,676 [1]
Thereafter 1,662,286 [1]
Total $ 24,312,847
Unrecorded number of forward orders | aircraft 426
Unrecorded number of purchase-leaseback transactions | aircraft 12
[1] Includes commitments to purchase 426 aircraft and 12 purchase and leaseback transactions.