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

Maintenance rights intangible and lease premium, net (Details)

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Maintenance rights intangible and lease premium, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Maintenance Rights Intangible And Lease Premium, Net [Abstract]    
Maintenance rights intangible $ 1,464,599 $ 2,117,034
Lease premium, net 37,259 50,891
Maintenance rights intangible and lease premium, net $ 1,501,858 $ 2,167,925