Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 3,821,384	$ 3,611,440
Accumulated depreciation	(1,550,728)	(1,481,506)
Property and equipment, net	2,270,656	2,129,934
Flight Equipment [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	140,200
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	3,405,297	3,301,113
Operating Leases, Future Minimum Payments Receivable, in Two Years	237,400
Operating Leases, Future Minimum Payments Receivable, in Three Years	187,400
Operating Leases, Future Minimum Payments Receivable, in Four Years	175,300
Operating Leases, Future Minimum Payments Receivable, in Five Years	157,200
Ground equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	68,565	64,641
facilities, leasehold improvements and office equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	39,216	38,769
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 308,306	$ 206,917