Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012 segments	Jun. 30, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments (in segments)				2
Total revenues	$ 153,554	$ 193,061		$ 299,060	$ 368,188
Customer revenues	153,554	193,061		299,060	368,188
Depreciation and amortization expense	21,514	23,878		41,814	46,249
Net unallocated interest expense	(3,671)	(3,537)		(7,218)	(7,640)
Net gain (loss) on derivative instruments	202	376		662	(3,556)
Write-off of unamortized debt issuance costs	0	(16)	(6,800)	0	(2,886)
Pre-tax earnings from continuing operations	18,171	19,657		28,914	24,247
Assets	1,017,259			1,017,259		993,719
CAM [Member]
Segment Reporting Information [Line Items]
Total revenues	38,067	32,762		75,918	64,890
Customer revenues	18,635	15,824		38,024	29,895
Depreciation and amortization expense	14,680	13,663		29,101	25,926
Segment earnings (loss)	16,667	13,634		33,485	27,100
Net unallocated interest expense	(3,100)	(2,600)		(6,000)	(5,100)
Assets	780,858			780,858		760,588
ACMI Services [Member]
Segment Reporting Information [Line Items]
Total revenues	121,630	164,709		234,825	311,414
Customer revenues	121,389	164,597		234,584	311,032
Depreciation and amortization expense	6,755	10,253		12,559	20,401
Segment earnings (loss)	(1,582)	4,560		(9,797)	2,050
Net unallocated interest expense	(200)	(300)		(500)	(600)
Assets	153,557			153,557		137,640
All other [Member]
Segment Reporting Information [Line Items]
Total revenues	26,682	25,469		55,103	50,907
Customer revenues	13,530	12,640		26,452	27,261
Depreciation and amortization expense	79	(38)		154	(78)
Segment earnings (loss)	3,228	1,675		5,229	3,329
Assets	82,844			82,844		95,491
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
Total revenues	(32,825)	(29,879)		(66,786)	(59,023)
Net unallocated interest expense [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	$ (344)	$ (572)		$ (665)	$ (1,790)