Property and Equipment (Narrative) (Details) (USD $)	12 Months Ended						3 Months Ended	12 Months Ended					3 Months Ended			3 Months Ended	1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Aircraft and flight equipment [Member]	Dec. 31, 2011 Aircraft and flight equipment [Member]	Dec. 31, 2010 Aircraft and flight equipment [Member]	Sep. 30, 2011 CAM [Member]	Dec. 31, 2012 CAM [Member]	Dec. 31, 2011 CAM [Member]	Dec. 31, 2010 CAM [Member]	Dec. 31, 2012 CAM [Member] Aircraft and flight equipment [Member]	Dec. 31, 2011 CAM [Member] Aircraft and flight equipment [Member]	Sep. 30, 2011 Boeing 727 and DC-8 aircraft and flight equipment [Member] Aircraft and flight equipment [Member]	Dec. 31, 2012 Boeing 727 and DC-8 aircraft and flight equipment [Member] Aircraft and flight equipment [Member]	Dec. 31, 2011 Boeing 727 and DC-8 aircraft and flight equipment [Member] Aircraft and flight equipment [Member]	Dec. 31, 2011 BAX/Schenker [Member]	May 31, 2010 DHL [Member] Boeing 767 non-standard freighter aircraft [Member] Aircraft and flight equipment [Member] aircrafts	May 31, 2010 DHL [Member] DC-9 Aircraft [Member] Aircraft and flight equipment [Member] aircrafts
Property, Plant and Equipment [Line Items]
Leased aircraft, carrying value											$ 273,400,000	$ 316,400,000
Operating Leases, Future Minimum Payments Receivable [Abstract]
Minimum future lease payments, Due within next 12 months				53,000,000
Minimum future lease payments, Due within next 2 years				52,400,000
Minimum future lease payments, Due within next 3 years				52,400,000
Minimum future lease payments, Due within next 4 years				45,000,000
Minimum future lease payments, Due within next 5 years				20,200,000
Impairment of aircraft	0	22,065,000	0				(6,800,000)	0	6,761,000	0			22,100,000
Aircraft and engines held for sale	3,360,000	9,831,000												3,400,000	9,800,000
Proceeds from sale of flight equipment				5,800,000	11,100,000	32,000,000											29,700,000
Proceeds from maintenance cost reimbursement																$ 10,700,000
Number of aircrafts sold																	5	26