Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
REVENUES	$ 177,385	$ 147,025
Customer revenues	177,385	147,025
Depreciation and amortization expense	32,534	28,993
Net unallocated interest expense	(2,699)	(3,065)
Net loss on financial instruments	(528)	(13)
Pre-tax earnings from continuing operations	12,148	14,473
Assets	1,138,066		$ 1,041,721
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	177,385	147,025
Customer revenues	177,385	147,025
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	51,726	42,854
Customer revenues	51,726	42,854
Depreciation and amortization expense	22,730	20,910
Segment earnings (loss)	19,510	14,438
Net unallocated interest expense	(2,300)	(2,600)
Assets	875,726		804,776
CAM [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	28,761	19,881
Customer revenues	28,761	19,881
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	114,956	105,468
Customer revenues	114,956	105,468
Depreciation and amortization expense	9,544	8,091
Segment earnings (loss)	(10,356)	(2,571)
Assets	159,698		154,852
ACMI Services [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	114,956	105,468
Customer revenues	114,956	105,468
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	55,011	35,606
Customer revenues	55,011	35,606
Depreciation and amortization expense	260	(8)
Segment earnings (loss)	3,868	3,076
Assets	102,642		$ 82,093
All other [Member] \| Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	33,668	21,676
Customer revenues	33,668	21,676
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	(346)	(457)
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(44,308)	(36,903)
Customer revenues	$ (44,308)	$ (36,903)

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