Segment Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segments	Mar. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable segments (in segments)	2
Interest expense	$ 3,823	$ 3,132
ACMI Services [Member]
Segment Reporting Information [Line Items]
Interest expense	100	200
CAM [Member]
Segment Reporting Information [Line Items]
Interest expense	$ 3,300	$ 2,600