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
Dec. 31, 2017
USD ($)
aircraft
Mar. 31, 2017
aircraft
engine
Dec. 31, 2016
USD ($)
aircraft
engine
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of aircraft held for sale     6
Net book value of flight equipment held for sale | $ $ 630,789   $ 107,392
Number of engine held for sale | engine     4
Number of aircraft held reclassified to operating lease   2  
Number of aircraft sold   4  
Number of engine sold | engine   4  
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 18    
Net book value of flight equipment held for sale | $ $ 630,800    
Maintenance and security deposit received from lessee | $ $ 115,000