Goodwill and Other Intangibles (Schedule Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Finite and Indefinite-lived Intangible Assets by Major Class [Line Items]
Incentive to Lessee		$ 84,910	$ 54,730
Warranted granted adding to lease incentive intangible	$ 39,940
Amortization of Lease Incentives	(9,760)
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Carrying value at beginning of period	5,453
Carrying value at beginning of period	8,453
Amortization expense	(415)
Carrying value at end of period	5,453	$ 5,038	$ 5,453
Carrying value at end of period	8,038
ACMI Services [Member] | Airline Certificates [Member]
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Carrying value at beginning of period	3,000
Amortization expense	0
Carrying value at end of period	$ 3,000