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Flight equipment held for sale (Details)
$ in Thousands
 3 Months Ended
Jun. 30, 2018
aircraft
Mar. 31, 2018
aircraft
Dec. 31, 2018
USD ($)
aircraft
Dec. 31, 2017
USD ($)
aircraft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of aircraft held for sale       18
Net book value of flight equipment held for sale | $     $ 184,129 $ 630,789
Number of aircraft sold 5 12    
Number of aircraft held reclassified to operating lease   1    
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     7  
Net book value of flight equipment held for sale | $     $ 184,100  
Maintenance and security deposit received from the lessee to be assumed by the buyers of the aircraft | $     $ 27,000