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

Net investment in finance and sales-type leases (Components of net investment) (Details)

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Net investment in finance and sales-type leases (Components of net investment) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
lease
Dec. 31, 2017
USD ($)
Flight Equipment, Net [Abstract]    
Future minimum lease payments to be received $ 708,934 $ 865,456
Estimated residual values of leased flight equipment (unguaranteed) 321,739 498,894
Less: Unearned income (274,791) (368,661)
Net investment in finance and sales-type leases, before allowance for credit losses 755,882 995,689
Less: Allowance for credit losses 0 [1] 0
Net investment in finance and sales-type leases $ 755,882 $ 995,689
Number of finance leases, written off for credit losses | lease 4  
Provision for credit losses on finance leases $ 11,100  
[1] During the year ended December 31, 2016, we recognized a direct write-off for credit losses on four finance leases of $11.1 million, which was recorded in leasing expenses in our Consolidated Income Statement.