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

Flight equipment held for sale (Details)

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Flight equipment held for sale (Details)
$ in Thousands
 3 Months Ended
Sep. 30, 2019
aircraft
Mar. 31, 2019
aircraft
Dec. 31, 2019
USD ($)
aircraft
Dec. 31, 2018
USD ($)
aircraft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of aircraft held for sale | aircraft       7
Net book value of flight equipment held for sale | $     $ 336,592 $ 184,129
Number of aircraft sold | aircraft 1 6    
Flight Equipment Held-for-sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of aircraft held for sale | aircraft     14  
Net book value of flight equipment held for sale | $     $ 336,600  
Maintenance and security deposit received from the lessee to be assumed by the buyers of the aircraft | $     $ 91,000