Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012 Aircraft	Jun. 30, 2012 Aircraft	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair Value Measurements (Textual) [Abstract]
Asset Impairment Charges	$ 78,676	$ 10,111	$ 1,236	$ 5,200	$ 88,787	$ 6,436
Maintenance Revenue from Terminated Leases and Scheduled Lease Expirations	10,159	2,447		2,267
Numberofimpaired767-300ERs	4
Numberofimpaired737classicaircraft	8
NumberofimpairedA310-300Faircraft	1
Impairmentchargefor12aircraftthatfailedrecoverabilitytest	67,370
Totalnumberofreducedlifeaircraft	7
NumberofreducedlifeA330-300s	1
Numberofreducedlife767-300ERs	5
NumberofreducedlifeMD-11SFs	1
NumberofA320-200aircraftbeingsoldimpaired	2
Impairmentchargeforaircraftbeingsold	11,306
Lease Incentive Accrual Reversed	1,157			878
Number of Impaired Aircraft		2
Aircraft Impaired and Subsequently Sold		1
Aircraft Returned from Lessee and Subsequently Impaired		1
Numberofaircraftwithchangeindepreciation	22
4thquarterimpactondepreciationexpense	838
2013impactondepreciationexpense	$ 1,442