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Net investment in finance and sales-type leases (Minimum future lease payments to be received on finance and sales-type leases) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Flight Equipment, Net [Abstract]  
2019 $ 150,384
2020 129,698
2021 113,958
2022 93,787
2023 75,843
Thereafter 228,595
Minimum future lease payments on finance and sales-type leases $ 792,265