Segment Reporting - Operating Revenue and Direct Contribution For Our Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenue:
Customer incentive asset amortization	$ (9,534)	$ (6,936)	$ (18,556)	$ (13,222)
Other	4,383	4,362	8,608	8,704
Total Operating Revenue	825,253	663,918	1,468,755	1,343,601
Direct Contribution:
Total Direct Contribution for Reportable Segments	210,185	65,815	323,972	170,482
Unallocated expenses and (income), net	(50,308)	(81,927)	(139,029)	(162,064)
Loss on early extinguishment of debt	(74)	0	(74)	(245)
Unrealized gain (loss) on financial instruments	(30,671)	42,300	(29,747)	(4,275)
Special charge	(15,934)	(3,269)	(15,934)	(3,269)
Transaction-related expenses	(1,275)	(734)	(1,796)	(3,261)
Gain (loss) on disposal of aircraft	(2)	0	6,715	0
Income (loss) before income taxes	111,921	22,185	144,107	(2,632)
Interest income	(224)	(1,278)	(704)	(3,322)
Interest expense	28,950	30,045	58,225	60,398
Capitalized interest	(132)	(627)	(325)	(1,090)
Loss on early extinguishment of debt	74	0	74	245
Unrealized (gain) loss on financial instruments	30,671	(42,300)	29,747	4,275
Other (income) expense, net	(50,598)	945	(49,392)	(2,030)
Operating Income	120,662	8,970	181,732	55,844
ACMI [Member]
Operating Revenue:
Operating Revenue	291,951	307,278	570,695	613,845
Direct Contribution:
Total Direct Contribution for Reportable Segments	14,495	40,640	66,802	80,647
Charter [Member]
Operating Revenue:
Operating Revenue	497,547	315,679	825,176	620,793
Direct Contribution:
Total Direct Contribution for Reportable Segments	185,969	14,084	236,750	43,217
Dry Leasing [Member]
Operating Revenue:
Operating Revenue	40,906	43,535	82,832	113,481
Direct Contribution:
Total Direct Contribution for Reportable Segments	$ 9,721	$ 11,091	$ 20,420	$ 46,618