Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
REVENUES	$ 254,101	$ 193,261	$ 745,229	$ 547,195
Customer revenues	254,101	193,261	745,229	547,195
Depreciation and amortization expense	37,605	33,939	111,828	99,605
Net unallocated interest expense	(4,351)	(2,897)	(11,658)	(8,229)
Net loss on financial instruments	(34,433)	(8,473)	(100,213)	(3,443)
Non-operating charges from non-consolidating affiliates	(945)	0	(945)	0
Pre-tax earnings from continuing operations	(20,769)	3,123	(53,107)	34,034
Assets	1,486,903		1,486,903		$ 1,259,330
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	254,101	193,261	745,229	547,195
Customer revenues	254,101	193,261	745,229	547,195
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	58,465	46,346	155,973	145,511
Customer revenues	58,465	46,346	155,973	145,511
Depreciation and amortization expense	26,829	22,958	31,368	68,295
Segment earnings (loss)	19,445	16,110	45,570	51,849
Net unallocated interest expense	(4,000)	(2,900)	(10,900)	(7,800)
Assets	1,140,559		1,140,559		971,986
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	40,940	27,920	104,102	86,068
Customer revenues	40,940	27,920	104,102	86,068
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	146,943	128,702	436,391	357,803
Customer revenues	146,943	128,702	436,391	357,803
Depreciation and amortization expense	9,805	10,528	77,383	30,300
Segment earnings (loss)	(5,223)	(9,686)	(8,841)	(27,172)
Assets	175,963		175,963		164,489
ACMI Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	146,938	128,702	436,386	357,803
Customer revenues	146,938	128,702	436,386	357,803
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	94,470	65,328	300,184	177,592
Customer revenues	94,470	65,328	300,184	177,592
Depreciation and amortization expense	971	453	3,077	1,010
Segment earnings (loss)	655	5,089	11,977	13,087
Assets	170,381		170,381		$ 122,855
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	66,223	36,639	204,741	103,324
Customer revenues	66,223	36,639	204,741	103,324
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	(268)	83	(655)	(287)
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(45,777)	(47,115)	(147,319)	(133,711)
Customer revenues	$ (45,777)	$ (47,115)	$ (147,319)	$ (133,711)