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Net investment in finance and sales-type leases (Components of net investment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Flight Equipment, Net [Abstract]    
Future minimum lease payments to be received $ 792,265 $ 865,456
Estimated residual values of leased flight equipment (unguaranteed) 528,916 498,894
Less: Unearned income (317,895) (368,661)
Net investment in finance and sales-type leases $ 1,003,286 $ 995,689