Segment and Revenue Information - Other Segment Information From Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 342,985	$ 331,064	$ 308,448
Interest expense	(72,704)	(46,861)	(58,790)
Net (loss) gain on financial instruments	(962)	9,022	29,979
Debt issuance costs	(936)	0	(6,505)
Settlement charges and non-service component gains of retiree benefits	(37,017)	20,046	17,827
Loss from non-consolidated affiliates	(4,740)	(7,607)	(2,577)
Pre-tax earnings from continuing operations	84,239	260,498	301,205
Significant Reconciling Items
Segment Reporting Information [Line Items]
Interest expense	(2,362)	(1,748)	(2,525)
CAM
Segment Reporting Information [Line Items]
Depreciation and amortization	243,537	231,663	203,675
Interest expense	(48,136)	(30,880)	(38,160)
Revenue	109,415	143,008	106,161
ACMI Services
Segment Reporting Information [Line Items]
Depreciation and amortization	96,762	96,996	101,541
Interest expense	(21,440)	(13,818)	(18,066)
Revenue	32,006	95,198	158,733
All Other
Segment Reporting Information [Line Items]
Depreciation and amortization	2,686	2,405	3,232
Revenue	$ (11,165)	$ 2,579	$ 112