Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating Expenses	$ 330,176	$ 325,307	$ 1,024,262	$ 924,056
REVENUES	404,146	366,073	1,171,217	1,048,832
Customer revenues	404,146	366,073	1,171,217	1,048,832
Depreciation and amortization expense	67,974	64,149	205,607	190,052
Net unallocated interest expense	(15,440)	(16,712)	(47,808)	(50,906)
Net (loss) gain on financial instruments	(53,393)	91,952	(56,072)	60,566
Pre-tax earnings from continuing operations	5,642	111,088	40,223	115,179
Assets	2,962,831		2,962,831		$ 2,820,178
Income Tax Expense (Benefit)		6,003	17,397	14,092
Business Combination, Acquisition Related Costs	0	0	0	(373)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	2,897	(2,351)	8,693	(7,053)
Net earnings from continuing operations	(5,745)	105,085	22,826	101,087
Income Tax (Expense) Benefit, Continuing Operations, Government Grants	21,726	0	31,547	0
Asset Impairment Charges	0	0	(39,075)	0
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	404,146	366,073	1,171,217	1,048,832
Customer revenues	404,146	366,073	1,171,217	1,048,832
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	300,189	272,188	871,958	785,082
Customer revenues	300,189	272,188	871,958	785,082
Depreciation and amortization expense	25,336	24,171	76,032	71,131
Segment earnings (loss)	18,637	4,375	56,699	17,658
Net unallocated interest expense	(4,803)	(6,530)	(15,749)	(19,520)
Assets	798,739		798,739		830,620
ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES		272,171	871,945	784,993
Customer revenues		272,171	871,945	784,993
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	82,281	87,762	239,373	226,228
Customer revenues	82,281	87,762	239,373	226,228
Depreciation and amortization expense	1,217	709	3,083	2,134
Segment earnings (loss)	(724)	2,939	(2,915)	8,848
Assets	163,181		163,181		130,372
All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES		51,895	151,168	140,270
Customer revenues		51,895	151,168	140,270
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	76,268	71,004	225,301	210,610
Customer revenues	76,268	71,004	225,301	210,610
Depreciation and amortization expense	41,421	39,269	126,492	116,787
Segment earnings (loss)	19,781	17,428	55,241	50,285
Net unallocated interest expense	(9,747)	(9,494)	(29,709)	(28,838)
Assets	1,997,276		1,997,276		1,857,687
CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES		42,007	148,104	123,569
Customer revenues		42,007	148,104	123,569
Discontinued operations [Member]
Segment Reporting Information [Line Items]
Assets	3,635		3,635		$ 1,499
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	(797)	(610)	(2,133)	(2,293)
Non-operating charges from a non-consolidating affiliate	(2,485)	(2,645)	(11,762)	(12,459)
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(54,592)	(64,881)	(165,415)	(173,088)
Customer revenues	(54,592)	(64,881)	(165,415)	(173,088)
Accounting Standards Update 2014-09 [Member]
Segment Reporting Information [Line Items]
Income Tax Expense (Benefit)	(11,387)
Accounting Standards Update 2014-09 [Member] \| ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	300,189
Customer revenues	300,189
Accounting Standards Update 2014-09 [Member] \| Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	26,063	24,745	78,749	82,029
Customer revenues	26,063	24,745	78,749	82,029
Accounting Standards Update 2014-09 [Member] \| All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	52,548	51,895	151,168	140,270
Customer revenues	52,548	51,895	151,168	140,270
Accounting Standards Update 2014-09 [Member] \| CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	51,409
Customer revenues	51,409
Accounting Standards Update 2014-09 [Member] \| Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	19,887	20,728	50,498	50,441
Customer revenues	19,887	20,728	50,498	50,441
Accounting Standards Update 2014-09 [Member] \| All Other non MRO or Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	6,598	6,422	21,921	7,800
Customer revenues	$ 6,598	$ 6,422	$ 21,921	$ 7,800

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