Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segments	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
REVENUES	$ 389,277	$ 348,183
Deferred Revenue, Revenue Recognized	2,700	2,700
Deferred Revenue	$ 4,000		$ 3,000
Number of reportable segments (in segments) | segments	2
Interest expense	$ 16,323	17,390
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	389,277	348,183
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	284,165	257,956
Interest expense	5,301	6,549
Property, Plant and Equipment, Additions	25,900
ACMI Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES		257,953
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	74,163	70,350
Interest expense	10,255	9,965
Property, Plant and Equipment, Additions	116,100
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES		$ 41,609
Flight Equipment [Member]
Segment Reporting Information [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	143,600		186,800
Operating Leases, Future Minimum Payments Receivable, in Two Years	182,800		178,200
Operating Leases, Future Minimum Payments Receivable, in Three Years	156,600		152,000
Operating Leases, Future Minimum Payments Receivable, in Four Years	114,700		110,100
Operating Leases, Future Minimum Payments Receivable, in Five Years	80,100		75,500
Operating Leases, Future Minimum Payments Receivable, Thereafter	$ 195,500		$ 186,200