Goodwill and Other Intangibles (Schedule Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Finite and Indefinite-lived Intangible Assets by Major Class [Line Items]
Incentive to Lessee		$ 159,629	$ 63,780
Warranted granted adding to lease incentive intangible	$ 100,076
Amortization of Lease Incentives	(4,227)
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Carrying value at beginning of period	135,614
Carrying value at beginning of period	144,614
Amortization expense	(2,859)
Carrying value at end of period	135,614	$ 131,255	$ 135,614
Carrying value at end of period	140,255
lease intangible asset reclass	(1,500)
ACMI Services [Member] | Airline Certificates [Member]
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Carrying value at beginning of period	9,000
Amortization expense	0
Carrying value at end of period	$ 9,000