Segment Information (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) segments	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments (in segments) | segments	2
Interest expense	$ 11,318	$ 11,232	$ 13,937
Customer Revenues [Member]
Segment Reporting Information [Line Items]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	168221	206484	205005
ACMI Services [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Additions	$ 30,800
CAM [Member]
Segment Reporting Information [Line Items]
Interest expense	10,600	$ 9,400	$ 11,800
Property, Plant and Equipment, Additions	$ 227,900