Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Expenses	$ 325,307	$ 178,092	$ 924,056	$ 533,198
REVENUES	366,073	204,919	1,048,832	611,566
Customer revenues	366,073	204,919	1,048,832	611,566
Depreciation and amortization expense	64,149	43,201	190,052	124,825
Net unallocated interest expense	(16,712)	(5,608)	50,906	16,336
Net gain on financial instruments	91,952	17,895	60,566	28,707
Non-operating charges from a non-consolidating affiliate			(12,458)	(7,600)
Pre-tax earnings from continuing operations	111,088	38,579	115,179	89,418
Assets	2,744,833		2,744,833		$ 2,470,585
Income Tax Expense (Benefit)		5,646	(14,092)	(16,339)
Business Combination, Acquisition Related Costs	0	0	(373)	0
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(2,351)	2,045	(7,053)	6,135
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	366,073	204,919	1,048,832	611,566
Customer revenues	366,073	204,919	1,048,832	611,566
Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	20,728	19,540	50,441	51,853
Customer revenues	20,728	19,540	50,441	51,853
All Other non MRO or Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	6,422	576	7,800	2,035
Customer revenues	6,422	576	7,800	2,035
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	71,004	58,786	210,610	165,539
Customer revenues	71,004	58,786	210,610	165,539
Depreciation and amortization expense	39,269	31,590	116,787	91,055
Segment earnings (loss)	17,428	19,034	50,285	49,892
Net unallocated interest expense	(9,494)	(4,681)	(28,838)	(13,675)
Assets	1,810,351		1,810,351		1,577,182
CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES		41,366	123,569	115,270
Customer revenues		41,366	123,569	115,270
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	272,188	116,224	785,082	355,204
Customer revenues	272,188	116,224	785,082	355,204
Depreciation and amortization expense	24,171	10,950	71,131	31,502
Segment earnings (loss)	4,375	(341)	17,658	3,574
Net unallocated interest expense	(6,530)	(402)	(19,520)	(1,419)
Assets	778,031		778,031		759,131
ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES		116,209	784,993	355,172
Customer revenues		116,209	784,993	355,172
Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	24,745	27,228	82,029	87,236
Customer revenues	24,745	27,228	82,029	87,236
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	87,762	69,477	226,228	206,736
Customer revenues	87,762	69,477	226,228	206,736
Depreciation and amortization expense	709	661	2,134	2,268
Segment earnings (loss)	2,939	3,051	8,848	9,808
Assets	156,451		156,451		$ 134,272
All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	51,895	47,344	140,270	141,124
Customer revenues	51,895	47,344	140,270	141,124
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	(610)	(458)	(2,293)	(1,098)
Non-operating charges from a non-consolidating affiliate	2,645	2,647	12,459	7,600
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(64,881)	(39,568)	(173,088)	(115,913)
Customer revenues	(64,881)	$ (39,568)	$ (173,088)	$ (115,913)
Accounting Standards Update 2014-09 [Member]
Segment Reporting Information [Line Items]
Income Tax Expense (Benefit)	(6,003)
Accounting Standards Update 2014-09 [Member] \| CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	42,007
Customer revenues	42,007
Accounting Standards Update 2014-09 [Member] \| ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	272,171
Customer revenues	272,171
Accounting Standards Update 2014-09 [Member] \| All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	51,895
Customer revenues	$ 51,895

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