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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) from continuing operations available to common shareholders.

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Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating Expenses									$ 781,327	$ 968,800	$ 698,307
REVENUES	$ 280,779	$ 204,919	$ 203,607	$ 203,040	$ 322,971	$ 254,101	$ 253,211	$ 237,917	892,345	1,068,200	768,870
Customer revenues	280,779	$ 204,919	$ 203,607	$ 203,040	322,971	$ 254,101	$ 253,211	$ 237,917	892,345	1,068,200	768,870
Depreciation and amortization expense									178,895	154,556	135,496
Net unallocated interest expense									(28,799)	(17,023)	(11,318)
Net gain (loss) on financial instruments									7,296	(79,789)	(18,107)
Pre-tax earnings from continuing operations									87,478	(6,536)	34,454
Assets	2,470,585				1,548,844				2,470,585	1,548,844	1,259,330
Income Tax Expense (Benefit)									19,595	(28,276)	13,394
Business Combination, Acquisition Related Costs									(5,264)	0	0
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component									8,180	(6,105)	(6,815)
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									892,345	1,068,200	768,870
Customer revenues									892,345	1,068,200	768,870
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES									228,956	209,560	195,092
Customer revenues									228,956	209,560	195,092
Depreciation and amortization expense									126,856	108,106	92,396
Segment earnings (loss)									65,576	61,510	68,608
Net unallocated interest expense									(21,800)	(15,600)	(10,600)
Assets	1,577,182				1,192,890				1,577,182	1,192,890	971,986
CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES										140,434	117,642
Customer revenues										140,434	117,642
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES									548,839	614,741	492,859
Customer revenues									548,839	614,741	492,859
Depreciation and amortization expense									49,068	41,929	41,487
Segment earnings (loss)									17,717	8,557	(25,016)
Assets	759,131				189,379				759,131	189,379	164,489
ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES										614,721	492,859
Customer revenues										614,721	492,859
Ground Services [Member]
Segment Reporting Information [Line Items]
REVENUES									207,539	205,401	111,913
Customer revenues									207,539	205,401	111,913
Depreciation and amortization expense									3,397	3,324	1,477
Segment earnings (loss)									14,499	19,741	12,308
Assets	108,244				87,177				108,244	87,177	77,918
Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES										106,767	40,754
Customer revenues										106,767	40,754
All other [Member]
Segment Reporting Information [Line Items]
REVENUES									79,040	227,807	150,117
Customer revenues									79,040	227,807	150,117
Depreciation and amortization expense									(426)	1,197	136
Segment earnings (loss)									9,107	5,590	9,519
Assets	$ 26,028				$ 79,398				26,028	79,398	44,937
All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES										206,278	117,615
Customer revenues										206,278	117,615
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense									(6,729)	(1,322)	(545)
Non-operating charges from a non-consolidating affiliate									(10,468)	(3,135)	0
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									(172,029)	(189,309)	(181,111)
Customer revenues									(172,029)	(189,309)	(181,111)
Segment earnings (loss)									(12,436)	$ (11,583)	$ (5,498)
Accounting Standards Update 2014-09 [Member]
Segment Reporting Information [Line Items]
Operating Expenses									781,327
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									87,478
REVENUES									892,345
Customer revenues									892,345
Income Tax Expense (Benefit)									(19,595)
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic									67,883
Accounting Standards Update 2014-09 [Member] \| CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									156,516
Customer revenues									156,516
Accounting Standards Update 2014-09 [Member] \| ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									548,804
Customer revenues									548,804
Accounting Standards Update 2014-09 [Member] \| Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									117,832
Customer revenues									117,832
Accounting Standards Update 2014-09 [Member] \| All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									69,193
Customer revenues									69,193
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Segment Reporting Information [Line Items]
Operating Expenses									1,138,462
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									87,638
REVENUES									1,249,640
Customer revenues									1,249,640
Income Tax Expense (Benefit)									(19,559)
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic									68,079
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									156,516
Customer revenues									156,516
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									743,112
Customer revenues									743,112
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									100,790
Customer revenues									100,790
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									249,222
Customer revenues									249,222
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Segment Reporting Information [Line Items]
Operating Expenses									(357,135)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									(160)
REVENUES									(357,295)
Customer revenues									(357,295)
Income Tax Expense (Benefit)									(36)
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic									(196)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									0
Customer revenues									0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									(194,308)
Customer revenues									(194,308)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| Ground Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									17,042
Customer revenues									17,042
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] \| All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES									(180,029)
Customer revenues									$ (180,029)