Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating Expenses	$ 439,151	$ 325,253	$ 855,217	$ 644,482
REVENUES	509,668	409,872	995,528	785,960
Customer revenues	509,668	409,872	995,528	785,960
Depreciation and amortization expense	81,372	75,633	163,443	146,684
Net unallocated interest expense	(9,461)	(15,021)	(20,860)	(29,543)
Net gain on financial instruments	6,011	35,703	8,707	45,175
Pre-tax earnings from continuing operations	69,250	104,226	134,335	159,328
Assets	3,459,550		3,459,550		$ 3,267,335
Income Tax Expense (Benefit)		24,357	30,329	37,169
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	5,388	4,456	10,776	8,913
Net earnings from continuing operations	54,210	79,869	104,006	122,159
Income Tax (Expense) Benefit, Continuing Operations, Government Grants		38,300		66,300
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	509,668	409,872	995,528	785,960
Customer revenues	509,668	409,872	995,528	785,960
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	347,498	273,301	677,588	520,432
Customer revenues	347,498	273,301	677,588	520,432
Depreciation and amortization expense	24,248	24,768	49,438	47,749
Segment earnings (loss)	21,837	44,762	44,002	66,021
Net unallocated interest expense	(2,648)	(4,473)	(6,026)	(8,996)
Assets	967,950		967,950		872,311
ACMI Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	347,477	273,295	677,562	520,422
Customer revenues	347,477	273,295	677,562	520,422
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	107,879	97,236	210,414	190,934
Customer revenues	107,879	97,236	210,414	190,934
Depreciation and amortization expense	703	853	1,293	1,928
Segment earnings (loss)	191	3,161	1,742	3,550
Assets	125,882		125,882		177,012
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	81,391	69,901	160,475	138,062
Customer revenues	81,391	69,901	160,475	138,062
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	109,674	88,594	216,579	171,871
Customer revenues	109,674	88,594	216,579	171,871
Depreciation and amortization expense	56,421	50,012	112,712	97,007
Segment earnings (loss)	39,617	22,554	74,612	44,016
Net unallocated interest expense	(6,224)	(9,669)	(13,929)	(18,895)
Assets	2,365,718		2,365,718		$ 2,218,012
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	80,800	66,676	157,491	127,476
Customer revenues	80,800	66,676	157,491	127,476
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	(574)	(870)	(881)	(1,624)
Non-operating charges from a non-consolidating affiliate	(3,220)	965	(4,623)	(218)
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(55,383)	(49,259)	(109,053)	(97,277)
Customer revenues	(55,383)	(49,259)	(109,053)	(97,277)
Accounting Standards Update 2014-09 [Member]
Segment Reporting Information [Line Items]
Income Tax Expense (Benefit)	(15,040)
Accounting Standards Update 2014-09 [Member] | Ground Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	34,622	28,791	72,161	62,839
Customer revenues	34,622	28,791	72,161	62,839
Accounting Standards Update 2014-09 [Member] | All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	81,391	69,901	160,475	138,062
Customer revenues	81,391	69,901	160,475	138,062
Accounting Standards Update 2014-09 [Member] | Ground Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	26,970	29,022	52,071	52,482
Customer revenues	26,970	29,022	52,071	52,482
Accounting Standards Update 2014-09 [Member] | All Other non MRO or Ground Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	19,799	12,088	36,243	22,741
Customer revenues	$ 19,799	$ 12,088	$ 36,243	$ 22,741