AeroTurbine restructuring (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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
Lease termination fees	$ 0	$ 7,645	$ 0

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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