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Net investment in finance and sales-type leases (Components of net investment) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Net Investment in Leases, After Adoption of 842    
Future minimum lease payments to be received $ 749,700  
Estimated residual values of leased flight equipment 553,778  
Less: Unearned income (301,026)  
Net investment in finance and sales-type leases $ 1,002,452  
Net Investment in Leases, Before Adoption of 842    
Future minimum lease payments to be received   $ 792,265
Estimated residual values of leased flight equipment   528,916
Less: Unearned income   (317,895)
Net investment in finance and sales-type leases   $ 1,003,286