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AeroTurbine restructuring (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Lease termination fees $ (46,500) $ (63,200)  
Aero Turbine Restructuring Plan 2015 [Member]      
Restructuring Cost and Reserve [Line Items]      
Expense related to a lower of cost or market adjustment of parts inventory   36,000 $ 38,700
Lease termination fees $ 7,645 $ 0 $ 0