Goodwill and Other Intangibles (Schedule Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Finite and Indefinite-lived Intangible Assets by Major Class [Line Items]
Incentive to Lessee		$ 131,634	$ 146,678
Amortization of Lease Incentives	$ (15,044)
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Carrying value at beginning of period	122,680
Carrying value at beginning of period	131,680
Amortization expense	(8,575)
Carrying value at end of period	122,680	$ 114,105	$ 122,680
Carrying value at end of period	123,105
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