Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating Expenses	$ 1,413,050	$ 1,364,185	$ 1,275,186
REVENUES	1,734,282	1,570,575	1,452,183
Customer revenues	1,734,282	1,570,575	1,452,183
Depreciation and amortization expense	308,448	278,067	257,532
Net unallocated interest expense	(58,790)	(62,893)	(66,644)
Net gain (loss) on financial instruments	29,979	(100,771)	(12,302)
Pre-tax earnings from continuing operations	301,205	41,393	71,572
Assets	3,267,335	3,001,745	2,820,178
Income Tax Expense (Benefit)	72,224	16,314	11,589
Business Combination, Acquisition Related Costs	0	0	(373)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	17,827	12,032	(9,404)
Net earnings from continuing operations	228,980	25,079	59,983
Income Tax (Expense) Benefit, Continuing Operations, Government Grants	111,700	47,200
Asset Impairment Charges	0	(39,075)	0
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	1,734,282	1,570,575	1,452,183
Customer revenues	1,734,282	1,570,575	1,452,183
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	1,185,128	1,147,279	1,078,288
Customer revenues	1,185,128	1,147,279	1,078,288
Depreciation and amortization expense	101,541	101,748	96,191
Segment earnings (loss)	158,733	114,128	32,055
Net unallocated interest expense	(18,066)	(20,542)	(24,950)
Assets	872,311	811,516	830,620
ACMI Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	1,185,113	1,147,252	1,078,143
Customer revenues	1,185,113	1,147,252	1,078,143
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	375,571	334,300	314,014
Customer revenues	375,571	334,300	314,014
Depreciation and amortization expense	3,232	4,316	2,871
Segment earnings (loss)	112	(5,933)	13,422
Assets	177,012	152,601	131,871
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	275,881	218,276	205,934
Customer revenues	275,881	218,276	205,934
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	370,287	308,661	285,276
Customer revenues	370,287	308,661	285,276
Depreciation and amortization expense	203,675	172,003	158,470
Segment earnings (loss)	106,161	77,424	68,643
Net unallocated interest expense	(38,160)	(39,304)	(38,300)
Assets	2,218,012	2,037,628	1,857,687
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	273,288	205,047	168,106
Customer revenues	273,288	205,047	168,106
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	(2,525)	(2,825)	(3,024)
Non-operating charges from a non-consolidating affiliate	(2,577)	(13,587)	(17,445)
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(196,704)	(219,665)	(225,395)
Customer revenues	(196,704)	(219,665)	(225,395)
Accounting Standards Update 2014-09 [Member]
Segment Reporting Information [Line Items]
Income Tax Expense (Benefit)	(72,225)
Accounting Standards Update 2014-09 [Member] | Ground Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	127,378	114,425	117,772
Customer revenues	127,378	114,425	117,772
Accounting Standards Update 2014-09 [Member] | All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	275,881	218,276	205,934
Customer revenues	275,881	218,276	205,934
Accounting Standards Update 2014-09 [Member] | Ground Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	99,133	73,949	69,596
Customer revenues	99,133	73,949	69,596
Accounting Standards Update 2014-09 [Member] | All Other non MRO or Ground Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	49,370	29,902	18,566
Customer revenues	$ 49,370	$ 29,902	$ 18,566