Segment Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 segments	Jun. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments (in segments)			2
Interest expense	$ 3,554	$ 3,671	$ 6,686	$ 7,218
ACMI Services [Member]
Segment Reporting Information [Line Items]
Interest expense	100	200	300	500
CAM [Member]
Segment Reporting Information [Line Items]
Interest expense	$ 3,300	$ 3,100	$ 5,900	$ 6,000