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

(Maintenance rights and lease premium, net) (Details)

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(Maintenance rights and lease premium, net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Maintenance rights $ 794,798 $ 1,088,246
Lease premium, net 14,817 24,944
Maintenance rights and lease premium, net $ 809,615 $ 1,113,190