Goodwill and Other Intangibles (Schedule Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Finite and Indefinite-lived Intangible Assets by Major Class [Line Items]
Incentive to Lessee	$ 114,510	$ 126,007
Amortization of Lease Incentives	(11,497)
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Carrying value at beginning of period	111,316
Carrying value at beginning of period	120,316
Amortization expense	(5,289)
Carrying value at end of period	106,027	$ 111,316
Carrying value at end of period	115,027
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