Goodwill and Other Intangibles (Schedule Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Finite and Indefinite-lived Intangible Assets by Major Class [Line Items]
Finite-lived Intangible Assets Acquired		$ 134,000
intangible assets acquired		140,000
Below Market Lease, Amortization Income, Next Twelve Months				$ 20,500
Incentive to Lessee			$ 80,684	146,678	$ 63,780
Warranted granted adding to lease incentive intangible	$ 100,076
Amortization of Lease Incentives	(17,178)	(16,904)
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Carrying value at beginning of period	135,614	4,298
Carrying value at beginning of period	144,614	7,298
Amortization expense	(11,434)	(2,684)
Carrying value at end of period	135,614	4,298	4,298	122,680	$ 135,614
Carrying value at end of period	131,680	144,614	7,298
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months				11,400
Finite-Lived Intangible Assets, Amortization Expense, Year Two				10,600
Finite-Lived Intangible Assets, Amortization Expense, Year Three				10,600
Finite-Lived Intangible Assets, Amortization Expense, Year Four				10,600
Finite-Lived Intangible Assets, Amortization Expense, Year Five				10,600
Below Market Lease, Amortization Income, Year Two				22,200
Below Market Lease, Amortization Income, Year Three				22,300
Below Market Lease, Amortization Income, Year Four				17,700
Below Market Lease, Amortization Income, Year Five				$ 14,800
lease intangible asset reclass	(1,500)
ACMI Services [Member] | Customer Relationships [Member]
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Amortization expense	(11,400)	(2,700)	(1,200)
ACMI Services [Member] | Airline Certificates [Member]
Finite and Indefinite-lived Intangible Assets by Major Class [Line Items]
Indefinite-lived Intangible Assets Acquired		6,000
Finite and Indefinite-lived Intangible Assets [Roll Forward]
Carrying value at beginning of period	9,000	3,000
Amortization expense	0	0
Carrying value at end of period	$ 9,000	$ 9,000	$ 3,000