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Accrued maintenance liability (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Movement in Accrued Maintenance Liability [Roll Forward]    
Accrued maintenance liability at beginning of period $ 2,190,159 $ 2,237,494
Maintenance payments received 194,779 358,694
Maintenance payments returned (208,630) (206,456)
Release to income other than upon sale (224,207) (87,061)
Lessor contribution, top ups and other 65,365 4,148
Accrued maintenance liability at end of period $ 1,930,874 $ 2,242,753