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Flight equipment held for sale (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
USD ($)
aircraft
Jun. 30, 2019
USD ($)
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 | $ $ 184,129 $ 507,949
Number of aircraft sold | aircraft 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   19
Net book value of flight equipment held for sale | $   $ 507,900
Maintenance and security deposit received from the lessee to be assumed by the buyers of the aircraft | $   $ 117,000