Property and Equipment (Narrative) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Aircraft and engines held for sale	$ 2,952,000	$ 3,360,000
CAM [Member] | Aircraft and flight equipment [Member]
Property, Plant and Equipment [Line Items]
Leased aircraft, carrying value	267,300,000	273,400,000
Boeing 727 and DC-8 aircraft and flight equipment [Member] | Aircraft and flight equipment [Member]
Property, Plant and Equipment [Line Items]
Aircraft and engines held for sale	$ 3,000,000	$ 3,400,000