Segment Information (Segment Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenues	$ 138,904	$ 153,554	$ 282,183	$ 299,060
Customer revenues	138,904	153,554	282,183	299,060
Depreciation and amortization expense	21,765	21,514	42,685	41,814
Net unallocated interest expense	(3,554)	(3,671)	(6,686)	(7,218)
Net gain on derivative instruments	452	202	742	662
Pre-tax earnings from continuing operations	11,085	18,171	24,677	28,914
Assets	1,071,091		1,071,091		1,035,611
CAM [Member]
Segment Reporting Information [Line Items]
Total revenues	39,362	38,067	78,331	75,918
Customer revenues	17,845	18,635	36,181	38,024
Depreciation and amortization expense	14,803	14,680	29,319	29,101
Segment earnings (loss)	17,214	16,667	34,087	33,485
Net unallocated interest expense	(3,300)	(3,100)	(5,900)	(6,000)
Assets	841,634		841,634		810,664
ACMI Services [Member]
Segment Reporting Information [Line Items]
Total revenues	106,604	121,389	217,920	234,584
Customer revenues	106,604	121,389	217,920	234,584
Depreciation and amortization expense	6,692	6,755	12,830	12,559
Segment earnings (loss)	(9,093)	(1,582)	(14,497)	(9,797)
Net unallocated interest expense	(100)	(200)	(300)	(500)
Assets	171,430		171,430		161,650
All other [Member]
Segment Reporting Information [Line Items]
Total revenues	26,951	26,682	53,205	55,103
Customer revenues	14,455	13,530	28,082	26,452
Depreciation and amortization expense	270	79	536	154
Segment earnings (loss)	2,607	3,228	4,788	5,229
Assets	58,027		58,027		63,297
Eliminate inter-segment revenues [Member]
Segment Reporting Information [Line Items]
Total revenues	(34,013)	(32,584)	(67,273)	(66,545)
Net unallocated interest expense [Member]
Segment Reporting Information [Line Items]
Net unallocated interest expense	$ (95)	$ (344)	$ (443)	$ (665)