Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segments	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
REVENUES	$ 376,088	$ 389,277
Deferred Revenue, Revenue Recognized	2,700	2,700
Deferred Revenue	$ 1,300			$ 3,000
Number of reportable segments (in segments) | segments	2
Interest expense	$ 14,522	16,323
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	376,088	389,277
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	247,131	284,165
Interest expense	4,523	5,301
Property, Plant and Equipment, Additions	22,400
ACMI Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	247,126	284,161
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	83,277	74,163
Interest expense	9,226	10,255
Property, Plant and Equipment, Additions	102,500
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	60,800	$ 46,736
Flight Equipment [Member]
Segment Reporting Information [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	192,300		$ 222,400
Operating Leases, Future Minimum Payments Receivable, in Two Years	212,800		195,500
Operating Leases, Future Minimum Payments Receivable, in Three Years	168,300		150,500
Operating Leases, Future Minimum Payments Receivable, in Four Years	117,600		99,800
Operating Leases, Future Minimum Payments Receivable, in Five Years	105,400		90,700
Operating Leases, Future Minimum Payments Receivable, Thereafter	$ 275,300		$ 202,200