Segment Information (Entity-Wide Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Customer revenues	$ 404,146	$ 366,073	$ 1,171,217	$ 1,048,832
Deferred Revenue, Revenue Recognized	4,700	500	2,800	2,800
Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	404,146	366,073	1,171,217	1,048,832
ACMI Services [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions			63,200
Customer revenues	300,189	272,188	871,958	785,082
ACMI Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues		272,171	871,945	784,993
CAM [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions			323,400
Customer revenues	76,268	71,004	225,301	210,610
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues		42,007	148,104	123,569
All other [Member]
Segment Reporting Information [Line Items]
Customer revenues	$ 82,281	87,762	239,373	226,228
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues		$ 51,895	$ 151,168	$ 140,270