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Accrued maintenance liability (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Movement in Accrued Maintenance Liability [Roll Forward]    
Accrued maintenance liability at beginning of period $ 2,237,494 $ 2,461,799
Maintenance payments received 358,694 362,801
Maintenance payments returned (206,456) (276,144)
Release to income upon sale (64,066) (169,678)
Release to income other than upon sale (87,061) (113,184)
Lessor contribution, top ups and other 4,148 (12,803)
Accrued maintenance liability at end of period $ 2,242,753 $ 2,252,791