Segment Information (Segment Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
REVENUES	$ 253,211	$ 176,549	$ 491,128	$ 353,934
Customer revenues	253,211	176,549	491,128	353,934
Depreciation and amortization expense	37,781	33,132	74,223	65,666
Net unallocated interest expense	(3,759)	(2,633)	(7,307)	(5,332)
Net gain (loss) on financial instruments	(67,649)	5,558	(65,780)	5,030
Pre-tax earnings from continuing operations	(48,444)	18,763	(32,338)	30,911
Assets	1,384,873		1,384,873		$ 1,259,330
Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	253,211	176,549	491,128	353,934
Customer revenues	253,211	176,549	491,128	353,934
CAM [Member]
Segment Reporting Information [Line Items]
REVENUES	49,530	47,439	97,508	99,165
Customer revenues	49,530	47,439	97,508	99,165
Depreciation and amortization expense	26,253	22,607	50,554	45,337
Segment earnings (loss)	12,795	16,229	26,125	35,739
Net unallocated interest expense	(3,500)	(2,600)	(6,900)	(4,900)
Assets	1,081,308		1,081,308		971,986
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	32,380	29,387	63,162	58,148
Customer revenues	32,380	29,387	63,162	58,148
ACMI Services [Member]
Segment Reporting Information [Line Items]
REVENUES	144,499	114,145	289,448	229,101
Customer revenues	144,499	114,145	289,448	229,101
Depreciation and amortization expense	10,491	10,228	21,563	19,772
Segment earnings (loss)	87	(7,130)	(3,618)	(17,486)
Assets	179,908		179,908		164,489
ACMI Services [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	144,499	114,145	289,448	229,101
Customer revenues	144,499	114,145	289,448	229,101
All other [Member]
Segment Reporting Information [Line Items]
REVENUES	116,508	57,253	205,714	112,264
Customer revenues	116,508	57,253	205,714	112,264
Depreciation and amortization expense	1,037	297	2,106	557
Segment earnings (loss)	6,539	4,130	11,322	7,998
Assets	123,657		123,657		$ 122,855
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	76,332	33,017	138,518	66,685
Customer revenues	76,332	33,017	138,518	66,685
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	(216)	(24)	(387)	(370)
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
REVENUES	(57,326)	(42,288)	(101,542)	(86,596)
Customer revenues	$ (57,326)	$ (42,288)	$ (101,542)	$ (86,596)