Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Accrued maintenance liability (Details)

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Accrued maintenance liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movement in Accrued Maintenance Liability [Roll Forward]    
Accrued maintenance liability at beginning of period $ 2,237,494 $ 2,461,799
Maintenance payments received 736,423 743,256
Maintenance payments returned (352,032) (459,326)
Release to income other than upon sale (207,849) (228,081)
Lessor contribution, top ups and other 25,310 (18,914)
Accrued maintenance liability at end of period $ 2,190,159 $ 2,237,494