Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
REVENUES	$ 193,261	$ 142,305	$ 547,195	$ 437,683
Customer revenues	193,261	142,305	547,195	437,683
Depreciation and amortization expense	33,939	30,754	99,605	91,147
Net unallocated interest expense	(2,897)	(2,684)	(8,229)	(8,588)
Net loss on financial instruments			(100)	(300)
Net gain (loss) on financial instruments	(8,473)	96	(3,443)	347
Pre-tax earnings from continuing operations	3,123	10,347	34,034	42,063
Assets	1,215,332		1,215,332		$ 1,041,721
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	193,261	142,305	547,195	437,683
Customer revenues	193,261	142,305	547,195	437,683
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	46,346	42,574	145,511	131,060
Customer revenues	46,346	42,574	145,511	131,060
Depreciation and amortization expense	22,958	21,305	68,295	64,571
Segment earnings (loss)	16,110	13,482	51,849	42,361
Net unallocated interest expense	(2,900)	(2,300)	(7,800)	(7,200)
Assets	941,050		941,050		804,776
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	27,920	23,671	86,068	68,212
Customer revenues	27,920	23,671	86,068	68,212
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	128,702	99,918	357,803	309,278
Customer revenues	128,702	99,918	357,803	309,278
Depreciation and amortization expense	10,528	9,461	30,300	26,579
Segment earnings (loss)	(9,686)	(4,914)	(27,172)	(6,359)
Assets	164,755		164,755		154,852
ACMI Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	128,702	98,820	357,803	308,180
Customer revenues	128,702	98,820	357,803	308,180
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	65,328	38,398	177,592	106,183
Customer revenues	65,328	38,398	177,592	106,183
Depreciation and amortization expense	453	(12)	1,010	(3)
Segment earnings (loss)	5,089	2,077	13,087	6,993
Assets	109,527		109,527		$ 82,093
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	36,639	19,814	103,324	61,291
Customer revenues	36,639	19,814	103,324	61,291
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	83	(394)	(287)	1,279
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(47,115)	(38,585)	(133,711)	(108,838)
Customer revenues	$ (47,115)	$ (38,585)	$ (133,711)	$ (108,838)