Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
REVENUES	$ 237,917	$ 177,385
Customer revenues	237,917	177,385
Depreciation and amortization expense	36,442	32,534
Net unallocated interest expense	(3,548)	(2,699)
Net gain (loss) on financial instruments	1,869	(528)
Pre-tax earnings from continuing operations	16,106	12,148
Assets	1,340,811		$ 1,259,330
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	237,917	177,385
Customer revenues	237,917	177,385
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	47,978	51,726
Customer revenues	47,978	51,726
Depreciation and amortization expense	24,301	22,730
Segment earnings (loss)	13,330	19,510
Net unallocated interest expense	(3,300)	(2,300)
Assets	1,035,730		971,986
CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	30,782	28,761
Customer revenues	30,782	28,761
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	144,949	114,956
Customer revenues	144,949	114,956
Depreciation and amortization expense	11,072	9,544
Segment earnings (loss)	(3,705)	(10,356)
Assets	182,190		164,489
ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	144,949	114,956
Customer revenues	144,949	114,956
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	89,206	55,011
Customer revenues	89,206	55,011
Depreciation and amortization expense	1,069	260
Segment earnings (loss)	4,783	3,868
Assets	122,891		$ 122,855
All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	62,186	33,668
Customer revenues	62,186	33,668
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	(171)	(346)
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(44,216)	(44,308)
Customer revenues	$ (44,216)	$ (44,308)

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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